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CHAPTER 6 8-BIT TIMER/EVENT COUNTERS 50 TO 53
User’s Manual U15104EJ2V0UD
Figure 6-14. Operation Timing of 16-Bit Resolution Cascade Mode (Timers 50 and 51)
6.5 Notes on 8-Bit Timer/Event Counters 50 to 53
(1) Error on starting timer
An error of up to 1 clock occurs after the timer has been started until a match signal is generated. This is
because 8-bit timer counter 5n (TM5n) is started asynchronously with the count pulse.
Figure 6-15. Start Timing of 8-Bit Timer Counter
Count
clock
TM50
TM51
CR50
CR51
TCE50
TCE51
INTTM50
TO50
Operation enabled.
Count starts.
Interval time
00H
01H
N N
+
1
FFH 00H
FFH 00H
FFH 00H 01H
N 00H 01H
A 00H
00H
01H
02H
M
–
1 M
00H
B 00H
N
M
Interrupt request
generated.
Level inverted.
Counter cleared.
Operation
stops
Count pulse
TM5n count value
00H
01H
02H
03H
04H
Timer starts
n = 0 to 3