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ST7232AK1B1 Datasheet

  • ST7232AK1B1

  • 8-BIT MCU WITH 8K FLASH/ROM, ADC, 4 TIMERS, SPI, SCI INTERFA...

  • 1290.53KB

  • 154页

  • STMICROELECTRONICS   STMICROELECTRONICS

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ST7232A
POWER SAVING MODES
(Cont鈥檇)
8.3 WAIT MODE
WAIT mode places the MCU in a low power con-
sumption mode by stopping the CPU.
This power saving mode is selected by calling the
鈥榃FI鈥?instruction.
All peripherals remain active. During WAIT mode,
the I[1:0] bits of the CC register are forced to 鈥?0鈥?
to enable all interrupts. All other registers and
memory remain unchanged. The MCU remains in
WAIT mode until an interrupt or RESET occurs,
whereupon the Program Counter branches to the
starting address of the interrupt or Reset service
routine.
The MCU will remain in WAIT mode until a Reset
or an Interrupt occurs, causing it to wake up.
Refer to
Figure 21.
Figure 21. WAIT Mode Flow-chart
OSCILLATOR
PERIPHERALS
CPU
I[1:0] BITS
ON
ON
OFF
10
WFI
INSTRUCTION
N
RESET
N
INTERRUPT
Y
OSCILLATOR
PERIPHERALS
CPU
I[1:0] BITS
ON
OFF
ON
10
Y
256 OR 4096 CPU CLOCK
CYCLE DELAY
OSCILLATOR
ON
PERIPHERALS ON
CPU
ON
I[1:0] BITS
XX
1)
FETCH RESET VECTOR
OR SERVICE INTERRUPT
Note:
1. Before servicing an interrupt, the CC register is
pushed on the stack. The I[1:0] bits of the CC reg-
ister are set to the current software priority level of
the interrupt routine and recovered when the CC
register is popped.
36/154
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