Electronics America Single-Chip Microcontrollers User's Manual

CHAPTER 7 8-BIT TIMERS 50, 60, AND 61
User’s Manual U15331EJ4V1UD
145
Interval time
Count clock
TM60 count value
CR60
TCE60
INTTM60
TO60
FFH 00H7FH
00H
N00H
NN N N
80H
7FH
80H
FFH
00H
N
00H
N
N
N
TM50 count pulse
TM50 00H
X
X − 1
01H
CR50
X
X
X
7FH
80H FFH
00H
N
00H
N
N
N
X
X − 1
00H
t
Not cleared because TM50 does not match
Cleared because TM50 and TM60 match simultaneously
Count start
Interrupt not generated because
TM50 does not match
Interrupt acknowledgement Interrupt acknowledgement
Remark Interval time = (256X + N + 1) × t: X = 00H to FFH, N = 00H to FFH
Figure 7-19. Timing of Interval Timer Operation with 16-Bit Resolution