Data processing system having display controller with bursting direct
memory access
    1.
    发明授权
    Data processing system having display controller with bursting direct memory access 失效
    具有显示控制器的数据处理系统具有突发直接存储器访问

    公开(公告)号:US5859649A

    公开(公告)日:1999-01-12

    申请号:US440960

    申请日:1995-05-15

    CPC分类号: G06F3/147

    摘要: A data processing system (20) has a display controller (28) that uses bus arbitration and data bursting to supply display data for refreshing an LCD screen (49), utilizing a system memory (30) instead of a separate video RAM. A screen DMA (58) fills a line buffer (60) with display data from the system memory (30) in bursts of a predetermined number of words. The screen DMA (58) receives a faster clocking signal than is used by the CPU (22). This allows the screen DMA (58) to run faster than the CPU (22) to reduce bandwidth needed to retrieve the display data. In addition, if the CPU (22) clock frequency is changed for power management purposes, the LCD screen (49) is not affected since it uses a different clock. By using the system memory (30) for storing display data, pin count, packaging costs, and board space are reduced.

    摘要翻译: 数据处理系统(20)具有使用总线仲裁和数据突发来提供用于刷新LCD屏幕(49)的显示数据的显示控制器(28),利用系统存储器(30)代替单独的视频RAM。 屏幕DMA(58)以预定数量的字的突发填充来自系统存储器(30)的显示数据的行缓冲器(60)。 屏幕DMA(58)接收比CPU(22)使用的更快的时钟信号。 这允许屏幕DMA(58)比CPU(22)运行更快,以减少检索显示数据所需的带宽。 此外,如果为了电力管理而改变CPU(22)的时钟频率,则LCD屏幕(49)不受影响,因为它使用不同的时钟。 通过使用系统存储器(30)来存储显示数据,减少了引脚数,封装成本和电路板空间。

    Data processing system having a multi-function input/output port with
individual pull-up and pull-down control
    2.
    发明授权
    Data processing system having a multi-function input/output port with individual pull-up and pull-down control 失效
    数据处理系统具有具有单独上拉和下拉控制的多功能输入/输出端口

    公开(公告)号:US5752077A

    公开(公告)日:1998-05-12

    申请号:US440948

    申请日:1995-05-15

    摘要: A data processing system (20) has a multi-function scalable parallel I/O port (44). The I/O port (44) includes a plurality of I/O port circuits (55, 56) coupled to I/O terminals (67, 77) . The I/O port (44) can multiplex two functions onto one terminal (67,77) . One function is an I/O function and the other function is function under the control of an internal module (22, 24, 26, 32) connected to the terminal (67, 77). Each I/O port circuit (55, 56) has either a pull-down circuit (68) or a pull-up circuit (78) coupled to the terminal (67, 77). The pull-up and pull-down circuits (78, 68) are controllable using a control register (81, 82). The pull-up and pull-down circuits (78, 68) for each terminal (67, 77) can be individually selected, and function whether the I/O port (44) is selected or deselected.

    摘要翻译: 数据处理系统(20)具有多功能可伸缩并行I / O端口(44)。 I / O端口(44)包括耦合到I / O端子(67,77)的多个I / O端口电路(55,56)。 I / O端口(44)可以将两个功能复用到一个终端(67,77)上。 一个功能是I / O功能,另一个功能是在连接到端子(67,77)的内部模块(22,24,26,32)的控制下工作。 每个I / O端口电路(55,56)具有耦合到端子(67,77)的下拉电路(68)或上拉电路(78)。 上拉和下拉电路(78,68)可使用控制寄存器(81,82)来控制。 可以单独选择每个端子(67,77)的上拉和下拉电路(78,68),并且功能是I / O端口(44)是被选择还是被取消选择。

    Arrangement and method for producing a plurality of pulse width
modulated signals
    3.
    发明授权
    Arrangement and method for producing a plurality of pulse width modulated signals 失效
    用于产生多个脉冲宽度调制信号的布置和方法

    公开(公告)号:US6078277A

    公开(公告)日:2000-06-20

    申请号:US109719

    申请日:1998-07-02

    IPC分类号: G06F1/025 H03M1/82

    CPC分类号: H03K7/08 G06F1/025

    摘要: An arrangement and method for producing a plurality of pulse width modulated outputs, comprising: receiving values representative of durations of pulses to be generated at the outputs (210); producing values representative of the time differences (230) between transitions of pulses to be produced; and producing transitions in the pulses in the plurality of channels at times corresponding to the time Difference values.

    摘要翻译: 一种用于产生多个脉冲宽度调制输出的装置和方法,包括:接收代表在输出端产生的脉冲持续时间的值(210); 产生表示要产生的脉冲的转变之间的时间差(230)的值; 并且在对应于时间差值的时间产生多个信道中的脉冲的转换。

    Method for reducing power consumption in a portable electronic device
with a liquid crystal display screen
    4.
    发明授权
    Method for reducing power consumption in a portable electronic device with a liquid crystal display screen 失效
    一种利用液晶显示屏在便携式电子设备中降低功耗的方法

    公开(公告)号:US5890799A

    公开(公告)日:1999-04-06

    申请号:US966831

    申请日:1997-11-10

    IPC分类号: G06F1/32 G06F1/00

    CPC分类号: G06F1/3218

    摘要: A method and apparatus for reducing power consumption in a portable electronic device (100) with an LCD screen (104) and operating with a CPU (114) switchable between a high power mode and a low power mode. When input commences on a surface of the LCD screen (104), an interrupt signaler (108) generates a first interrupt signal to an interrupt controller (112). Upon receiving the first interrupt signal, the interrupt controller (112) switches the CPU (114) from the low power mode to the high power mode, turning on at least one detection panel (106) coupled to the LCD screen (104) and to an ADC (110). When input ceases on the surface, the interrupt signaler (108) generates a second interrupt signal to switch the CPU (114) from the high power mode to the low power mode, turning off the at least one detection panel (106) and the ADC (110).

    摘要翻译: 一种用于利用LCD屏幕(104)降低便携式电子设备(100)中的功率消耗并且可以在高功率模式和低功率模式之间切换的CPU(114)操作的方法和装置。 当在LCD屏幕(104)的表面上开始输入时,中断信号器(108)向中断控制器(112)产生第一中断信号。 在中断控制器(112)接收到第一个中断信号后,将CPU(114)从低功率模式切换到高功率模式,打开耦合到LCD屏幕(104)的至少一个检测面板(106),并打开 ADC(110)。 当表面上的输入停止时,中断信号器(108)产生第二中断信号,以将CPU(114)从高功率模式切换到低功率模式,关断至少一个检测面板(106)和ADC (110)。

    Circuit and method for retaining data in DRAM in a portable electronic
device
    5.
    发明授权
    Circuit and method for retaining data in DRAM in a portable electronic device 失效
    用于在便携式电子设备中保留DRAM中的数据的电路和方法

    公开(公告)号:US5825706A

    公开(公告)日:1998-10-20

    申请号:US958645

    申请日:1997-10-27

    CPC分类号: G11C11/406

    摘要: When an external reset signal EXRST is asserted received by a reset unit (6), it is synchronised with an internal clock to produce an internal reset signal INRST, which is applied to a CPU (4) and other modules in the circuit to reset them. While the internal reset signal INRST is being applied to the CPU, the rate of a refresh signal being generated by a DRAM controller (7) for refreshing data in DRAM (3) is increased. Then, when the external reset signal EXRST is disabled, a delayed reset signal DLYRST is generated and applied to the DRAM controller (7) so that it is reset. The CPU, being already reset, can then quickly reconfigure the DRAM controller and re-enable it to resume refreshing the DRAM (4), thus maintaining the data in the DRAM.

    摘要翻译: 当由复位单元(6)接收到外部复位信号EXRST时,它与内部时钟同步,产生内部复位信号INRST,该内部复位信号INRST被施加到电路中的CPU(4)和其他模块以复位它们 。 当内部复位信号INRST被施加到CPU时,由用于刷新DRAM(3)中的数据的DRAM控制器(7)产生的刷新信号的速率增加。 然后,当外部复位信号EXRST被禁止时,生成延迟的复位信号DLYRST并将其施加到DRAM控制器(7),使得其被复位。 已经重置的CPU可以快速重新配置DRAM控制器,并重新启用它来恢复刷新DRAM(4),从而将数据保留在DRAM中。

    Method and apparatus for providing only that number of clock pulses
necessary to complete a task
    6.
    发明授权
    Method and apparatus for providing only that number of clock pulses necessary to complete a task 失效
    仅提供完成任务所需的时钟脉冲数的方法和装置

    公开(公告)号:US5680626A

    公开(公告)日:1997-10-21

    申请号:US444347

    申请日:1995-05-18

    IPC分类号: G06F9/46 G06F9/50 G06F1/32

    摘要: In a portable electronic device, a method and apparatus for providing a predetermined portion of a limited resource from a programmable resource allocators (PRAs) (240) to a processor (22) to execute a task (210) optimally. The processor (22) programming the PRA with a resource utilization input (RUI) (250) prior to executing the task (210). The RUI (250) stored in a task descriptor (220), and the task descriptor (220) and the task (210) stored in the memory (200).

    摘要翻译: 在便携式电子设备中,一种方法和装置,用于将有限资源的预定部分从可编程资源分配器(PRA)(240)提供给处理器(22)以最佳地执行任务(210)。 处理器(22)在执行任务(210)之前用资源利用率输入(RUI)(250)对PRA进行编程。 存储在任务描述符(220)中的RUI(250)和存储在存储器(200)中的任务描述符(220)和任务(210)。