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Z51F6412
Product Specification
PS030302-0212
P R E L I M I N A R Y
146
12.3 IDLE mode
The power control register is set to ‘01h’ to enter the IDLE Mode. In this mode, the internal oscillation
circuits remain active. Oscillation continues and peripherals are operated normally but CPU stops. It is
released by reset or interrupt. To be released by interrupt, interrupt should be enabled before IDLE
mode. If using reset, because the device becomes initialized state, the registers have reset value.
(Ex) MOV PCON, #0000_0001b ; setting of IDLE mode : set the bit of STOP and IDLE Control register
(PCON)
OSC
CPU Clock
/RESET
Normal Operation
BIT Counter
Stand-by Mode
Normal Operation
Release
Set PCON
to 01
Clear & Start
TST = 16ms
m-2
m-1
m
n
0
0
0
1
FD
FE
FF
0
1
External
Interrupt
OSC
Normal Operation
Release
CPU Clock
Stand-by Mode
Normal Operation
Figure 12-1 IDLE Mode Release Timing by External Interrupt
Figure 12-2 IDLE Mode Release Timing by /RESET