UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 249

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(4) Stopping PPG output
Caution If the PPG cycle is extremely short as compared with the time required to acknowledge an interrupt, the
Caution The output level of the TOn (n = 0, 1) pin when timer output is disabled (ENTOn = 0: n = 0, 1) is the inverse
If timer/counter 0 is stopped by clearing (0) the CE0 bit of the timer control register 0 (TMC0) during PPG signal output, the
active level is output irrespective of the output level at the time it was stopped.
value of CR01 cannot be rewritten by interrupt processing that is performed due to a match between the
timer register (TM0) and compare register (CR01). Use another method (for example, to poll the interrupt
request flags in software with all the interrupts masked).
of the value set in ALVn (n = 0, 1) bit. Caution is therefore required as the active level is output when timer
output is disabled when the PPG output function has been selected.
Figure 8-28 When Timer/Counter 0 is Stopped During PPG Signal Output
TM0
Count Value
TO0
0H
CHAPTER 8 TIMER/COUNTER 0
CR01
CR00
CR01
CR00
209