Cautions On 8-Bit Timer/Event Counters 1 And 2; Square-Wave Output Operation Timing; Bit Timer Registers 1 And 2 Start Timing - NEC PD78052 User Manual

Count Clock
TM1, TM2 Count Value 0000
CR10, CR20
INTTM2
TO2 Pin Output Note
Note The initial value of TO2 pin output can be set with the bits 6 and 7 (LVR2, LVS2) of 8-bit timer output control
register (TOC1).

9.5 Cautions on 8-Bit Timer/Event Counters 1 and 2

(1) Timer start errors
An error with a maximum of one clock may occur concerning the time required for a match signal to be
generated after timer start. This is because 8-bit timer registers 1 and 2 (TM1 and TM2) starts asynchronously
with the count pulse.
Count Pulse
TM1, TM2 Count Value
238
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 1 AND 2
Figure 9-13. Square-Wave Output Operation Timing
0001 0002 N-1
N
Figure 9-14. 8-Bit Timer Registers 1 and 2 Start Timing
00H 01H
Timer Start
N 0000 0001 0002
02H 03H
N-1 N 0000
04H