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W78LE516-24 Datasheet(PDF) 6 Page - Winbond |
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W78LE516-24 Datasheet(HTML) 6 Page - Winbond |
6 / 31 page Preliminary W78LE516 - 6 - Power Management Idle Mode Setting the IDL bit in the PCON register enters the idle mode. In the idle mode, the internal clock to the processor is stopped. The peripherals and the interrupt logic continue to be clocked. The processor will exit idle mode when either an interrupt or a reset occurs. Power-down Mode When the PD bit in the PCON register is set, the processor enters the power-down mode. In this mode all of the clocks are stopped, including the oscillator. To exit from power-down mode is by a hardware reset or external interrupts INT0 to INT1 when enabled and set to level triggered. Reduce EMI Emission The W78LE516 allows user to diminish the gain of on-chip oscillator amplifier by using programmer to clear the B7 bit of security register. Once B7 is set to 0, a half of gain will be decreased. Care must be taken if user attempts to diminish the gain of oscillator amplifier, reducing a half of gain may affect the external crystal operating improperly at high frequency. The value of C1 ana C2 may need some adjustment while running at lower gain. Reset The external RESET signal is sampled at S5P2. To take effect, it must be held high for at least two machine cycles while the oscillator is running. An internal trigger circuit in the reset line is used to deglitch the reset line when the W78LE516 is used with an external RC network. The reset logic also has a special glitch removal circuit that ignores glitches on the reset line. During reset, the ports are initialized to FFH, the stack pointer to 07H, PCON (with the exception of bit 4) to 00H, and all of the other SFR registers except SBUF to 00H. SBUF is not reset. W78LE516 Special Function Registers (SFRs) and Reset Values F8 FF F0 +B 00000000 CHPENR 00000000 F7 E8 EF E0 +ACC 00000000 E7 D8 +P4 xxxx1111 DF D0 +PSW 00000000 D7 C8 +T2CON 00000000 RCAP2L 00000000 RCAP2H 00000000 TL2 00000000 TH2 00000000 CF C0 XICON 00000000 P4CONA 00000000 P4CONB 00000000 SFRAL 00000000 SFRAH 00000000 SFRFD 00000000 SFRCN 00000000 C7 B8 +IP 00000000 CHPCON 0xx00000 BF |
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