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STPC4EEBC 数据表(PDF) 7 Page - STMicroelectronics |
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STPC4EEBC 数据表(HTML) 7 Page - STMicroelectronics |
7 / 93 page GENERAL DESCRIPTION Release 1.5 - January 29, 2002 7/93 - Peripheral activity detection. - Peripheral timer for detecting lack of peripheral activity - SUSP# modulation to adjust the system performance in various power down states of the system including full power on state. - Power control outputs to disable power from different planes of the board. Lack of system activity for progressively longer period of times is detected by the three power down timers. These timers can generate SMI interrupts to CPU so that the SMM software can put the system in decreasing states of power consumption. Alternatively, system activity in a power down state can generate SMI interrupt to allow the software to bring the system back up to full power on state. The chip-set supports up to three power down states: Doze state, Stand-by state and Suspend mode. These correspond to decreasing levels of power savings. Power down puts the STPC Consumer-II into suspend mode. The processor completes execution of the current instruction, any pending decoded instructions and associated bus cycles. During the suspend mode, internal clocks are stopped. Removing power down, the processor resumes instruction fetching and begins execution in the instruction stream at the point it had stopped. Because of the static nature of the core, no internal data is lost. 1.7. JTAG JTAG stands for Joint Test Action Group and is the popular name for IEEE Std. 1149.1, Standard Test Access Port and Boundary-Scan Architec-ture. This built-in circuitry is used to assist in the test, maintenance and support of functional circuit blocks. The circuitry includes a standard interface through which instructions and test data are communicated. A set of test features is defined, including a boundary-scan register so that a component is able to respond to a minimum set of test instructions. |
类似零件编号 - STPC4EEBC |
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类似说明 - STPC4EEBC |
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