参数资料
型号: M37640E8FP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP80
封装: 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80
文件页数: 76/96页
文件大小: 1477K
代理商: M37640E8FP
78
Ver 1.4
MITSUBISHI MICROCOMPUTERS
7640 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
1.25.2 Wait Mode
Use of the wait mode allows the microcomputer to be
placed in a state where excitation of the CPU is
stopped, but the clocks to the peripherals continue to
oscillate. This mode provides lower power dissipation
during the idle periods and quick wake-up time. The
microcomputer enters the wait mode when the WIT
instruction is executed.
Returning from wait mode is accomplished just as it is
when returning from stop mode, with the exception
that you need not provide time for the oscillator to sta-
bilize, because the oscillation never stopped.
Additionally, any peripheral interrupt can be used to
bring the microcomputer out of the wait mode. The
timing for the WIT instruction is shown in Figure 1.98.
Φ
out
SYNCout
RD
WR
Address
Data
Opcode
Invalid
S,CPMA2
PC + 1
PC
Xin
INTREQ
STPSIG
(PC + 1)
Sleep Period
Start of Interrupt Service Routine
Note: Return from a WIT instruction is caused by a interrupt.
Fig. 1.98. WIT Cycle Timing Diagram (WIT)
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