PD17012_15 Datasheet, PDF (145/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
12.4.5 Error of 12-bit timer
The 12-bit timer produces an error of a maximum of 1 basic clock in the following cases:
(1) When TMEN flag is manipulated
When the TMEN flag is set, an error of 0 to +1 clock occurs.
When the TMEN flag is cleared, an error of 0 to –1 clock occurs.
(2) When counter in operation is reset
When the counter is reset, an error of 0 to +1 clock occurs.
(3) When basic clock is changed during counter operation
An error of 0 to +1 clock of the new clock occurs.
12.4.6 Notes on using 12-bit timer
The interrupt by the 12-bit timer may be generated at the same time as the interrupt by basic timer 1 and CE reset.
If the timer must be updated even at CE reset, do not use the 12-bit timer. Instead, use basic timer 1.
Data Sheet U10101EJ4V0DS
143