Figure 7.7A Counter Operation During Standby Modes Or Operation Halt (For Interval Timer Function); States In Each Mode During 8-Bit Pwm Timer; Operation - Fujitsu F2MC-8L MB89620 Series Hardware Manual

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7. States in Each Mode during 8-bit PWM Timer Operation
This section describes the operation of the 8-bit PWM timer when the device changes
to sleep or stop mode or an operation halt request occurs during operation.
n Operation during Standby Mode or Operation Halt
Figures 7.7a and 7.7b show the counter value states when the device changes to sleep or stop
mode, or an operation halt request occurs, during operation of the interval timer function or
PWM timer function.
The counter halts and maintains its current value when the device changes to stop mode.
Operation starts again from the stored counter value after wake-up from stop mode by an
external interrupt. Therefore, the first interval time or PWM wave cycle does not match the set
value. Always initialize the 8-bit PWM timer after wake-up from stop mode.
l For interval timer function
* : The PTO pin goes to the high-impedance state during stop mode if the pin state specification bit in the
standby control register (STBC: SPL) is "1" and the PTO pin is not set to with a pull-up resistor (optional).
When the SPL bit is "0", the pin maintains its value prior to changing to stop mode.
Figure 7.7a Counter Operation during Standby Modes or Operation Halt (For
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CHAPTER 7 8-BIT PWM TIMER
COMR value (FF
Counter value
FF
H
00
H
Timer cycle
TIR bit
TPE bit
PTO pin
(OE = "1")
SLP bit
(STBC register)
STP bit
(STBC register)
Interval Timer Function)
)
H
Stop request
Cleared by the program
Sleep mode
Wake-up from sleep mode by IRQ4.
Wake-up from stop mode by an external interrupt.
Cleared by the operation halt.
Oscillation
stabilization delay time
Operation halts Operation restarts
*
Outputs an "L" level while operation is halted.
Stop mode
MB89620 series
Time