NEC uPD78056Y - Manual (Page 238)

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CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 1 AND 2
Figure 9-13. Square-Wave Output Operation Timing
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.
Figure 9-14. 8-Bit Timer Registers 1 and 2 Start Timing
Count Clock
TM1, TM2 Count Value
CR10, CR20
INTTM2
TO2 Pin Output Note
0000 0001 0002 N-1 N 0000 0001 0002 N-1 N 0000
N
Count Pulse
TM1, TM2 Count Value 00H 01H 02H 03H 04H
Timer Start