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SM5954 Datasheet(PDF) 42 Page - SyncMOS Technologies,Inc |
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SM5954 Datasheet(HTML) 42 Page - SyncMOS Technologies,Inc |
42 / 53 page SM5954 8-Bit Micro-controller 16KB with 4KB ISP Flash & 1KB RAM embedded Specifications subject to change without notice contact your sales representatives for the most recent information. ISSFD-M093 Ver C SM5954 04/17/2014 - 42 - 11. Power Management Unit Power management unit serves two power management modes, Idle and Power Down, for the users to do power saving function. Mnemonic: PCON Address: 87h 7 6 5 4 3 2 1 0 Reset SMOD - - - GF1 GF0 PD IDLE 00h GF1: General-purpose flag bit. GF0: General-purpose flag bit. PD: Power Down mode control bit. Setting this bit turning on the PD Mode. PD bit is always read as 0 IDLE: Idle mode control bit. Setting this bit turning on the Idle Mode. Idle bit is always read as 0 11.1 Idle mode An instruction that sets PCON.0 causes that to be the last instruction executed before going into the idle mode, the internal clock is gated off to the CPU but not to the interrupt, timer and serial port functions. There are two ways to terminate the idle. Activation of any enabled interrupt will cause PCON.0 to be cleared by hardware, terminating the idle mode. The interrupt will be serviced, and following RETI, the next instruction to be executed will be the one following the instruction that put the device into idle. Another way to wake-up from idle is to pull RESET high to generate internal hardware reset. 11.2 Power Down mode An instruction that sets PCON.1 cause that to be the last instruction executed before going into the Power-Down mode. In the power-down mode, the on-chip oscillator is stopped. The contents of on-chip RAM and SFRs are maintained. Be carefully to keep RESET pin active for at least 10ms in order for a stable clock. The SM5954 can be resumed from power-down state by RESET pin or external interrupt INT0/ INT1. When it is woken-up by RESET, the program will execute from the address 0000H. When it is woken-up by INT0 or INT1, the program will execute from the corresponding interrupt service routine. To enable wake-up by external interrupt pins, the associated interrupt control register (EA, EX0/EX1) must be configured correctly. Additionally, the control bit PDWUE in SCONF register must be enabled as well. Mnemonic: SCONF Address: BFh 7 6 5 4 3 2 1 0 Reset WDR - - PDWUE - ISPE OME ALEI 02H PDWUE: Power down wake-up enable bit. Set 1 to enable wake-up from power-down state by external pin int0 or int1. |
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