NEC mPD780973 Series Preliminary User's Manual page 116

TM1 interval time
t
Count clock
TM1
CR1
FF
TCE1
INTTM1
TM1 interval time
116
CHAPTER 8 8-BIT TIMER 1 TM1
Figure 8-4. Interval Timer Operation Timings (2/3)
(b) When CR1 = 00H
t
Count clock
TM1 00H 00H
CR1 00H
TCE1
INTTM1
Interval time
(c) When CR1 = FFH
01 FE
00H
00H
FF 00
FF
Interrupt received
Interval time
FE FF 00
FF
Interrupt
received