參數(shù)資料
型號(hào): M37640E8
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER
中文描述: 單芯片8位CMOS單片機(jī)
文件頁數(shù): 117/172頁
文件大?。?/td> 1193K
代理商: M37640E8
7600 Series
Mitsubishi Microcomputer
M37640E8-XXXF Preliminary Specification
Low Power Modes
7/9/98
2-105
2.16 Low Power Modes
This device has two low-power dissipation modes:
Stop
Wait
2.16.1 Stop Mode
Use of the stop mode allows the mcu to be placed in a state where no internal excitation of the
circuitry is taking place, thus resulting in extremely low power dissipation. The mcu enters the stop
mode when the STP instruction is executed. The internal state of the mcu after execution of the STP
instruction is as follows:
All internal oscillation stops with P2 and P2PER held high and P1 and P1PER held low.
Timer 1 and Timer 2 are loaded with FF
16
and 01
16
respectively.
The count source for Timer 1 is set to
Φ
/8 and the count source for Timer 2 is set to Timer 1
underflow.
Figure 2-120. STP Cycle Timing Diagram
Oscillation is restarted (that is, all clocks other than P1 and P2 begin to oscillate) when a reset or an
external interrupt is received. The interrupt control bit of the interrupt used to release the stop mode
must be set to a “1” and the I flag set to a “0” prior to the execution of the STP instruction. To
allow the oscillation source time to stabilize, the oscillation source is connected as the clock source for
the wake-up timer (Timer 1 and Timer 2 cascaded). When Timer 2 underflows, the system clocks P1
and P2 are restarted and the mcu services the interrupt that caused the return from the stop state. It
Φ
out
P1
P2
SYNC
out
RD
WR
Address
Data
Opcode
Invalid
S,CPMA2
PC + 1
PC
X
in
P1PER
P2PER
INTREQ
STPSIG
CPUOSC
(PC + 1)H
Sleep Period
Timer Countdown
(Oscillator stabilization)
Timer 2 underflow
Start of Interrupt Service
Routine
Note:
Return from a STP Instruction is caused by an interrupt, followed by the countdown and underflow of Timer 2
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