Figure 9.7 Counter Operation During Standby Modes Or Operation Halt; States In Each Mode During 16-Bit Timer/Counter Operation - Fujitsu F2MC-8L MB89620 Series Hardware Manual

7
9.

States in Each Mode during 16-bit Timer/Counter Operation

This section describes the operation of the 16-bit timer/counter 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
Figure 9.7 shows the counter value state when the device changes to sleep or stop mode, or an
operation stop request occurs, during operation of the interval timer function or counter 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 count of input pulse edges is not correct
value. Always initialize the 16-bit timer/counter after wake-up from stop mode.
Note: The counter maintains its value when halted (TMCR: TCS = "0").
192
CHAPTER 9 16-BIT TIMER/COUNTER
Counter value
FFFF
H
0000
H
Timer cycle
TCR value (0000
TCEF bit
TCS bit
Activate
SLP bit
(STBC register)
Wake-up from sleep mode by IRQ6
STP bit
(STBC register)

Figure 9.7 Counter Operation during Standby Modes or Operation Halt

Stop request
)
H
Cleared by the program
Sleep mode
Wake-up from stop mode by an external interrupt
Oscillation stabilization
delay time
Operation halts
Operation halts Operation reactivates
Stop mode
Time
MB89620 series