UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 354

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

(4) Stopping PPG output
314
Caution If the PPG cycle is extremely short as compared with the time required to acknowledge an interrupt,
Caution The output level of the TOn (n = 2/3) pin when timer output is disabled (ENTOn = 0, n = 2/3) is the inverse
If timer/counter 2 is stopped by clearing (0) the CE2 bit of the timer control register 1 (TMC1) during PPG signal output,
the active level is output irrespective of the output level at the time timer/counter 2 was stopped.
the value of CR2n cannot be rewritten by interrupt processing that is performed on match between timer
register 2 (TM2) and compare register (CR2n: n = 0, 1). Use another method (for example, to poll the
interrupt request flags in software with all the interrupts masked).
value of the value set in ALVn (n = 2/3) bits. Caution is therefore required as the active level is output
when timer output is disabled when the PPG output function has been selected.
Figure 10-34 When Timer/Counter 2 is Stopped During PPG Signal Output
TM2
Count Value
TO2
0H
CHAPTER 10 TIMER/COUNTER 2
CR21
CR20
CR21
CR20