Timing Of Square-Wave Output With 16-Bit Resolution - NEC PD789860 User Manual

TM40
count clock
TM40
00H N
count value
Not cleared because TM30 does not match
CR40 N N
TCE40
Count start
TM30
count clock
TM30 00H
X
CR30
INTTM40
Interrupt not generated because
TM30 does not match
Note
TMO
Note The initial value of TMO is low level when output is enabled (TOE40 = 1).
Remark X = 00H to FFH, N = 00H to FFH
Figure 9-18. Timing of Square-Wave Output with 16-Bit Resolution
7FH 80H FFH 00H
7FH 80H
N N N
01H
X
N
FFH 00H 00H 7FH 80H
Cleared because TM30 and TM40 match simultaneously
N N
X − 1
X 00H
X
Interrupt acknowledgement
FFH 00H N 00H
N
N N
X − 1
X 00H
Interrupt acknowledgement