MITSUBISHI MICROCOMPUTERS
4280 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
TIMERS
The 4280 Group has the programmable timer.
• Programmable timer
The programmable timer has a reload register and enables
the frequency dividing ratio to be set. It is decremented from a
setting value n. When it underflows (count to n + 1), a timer 1
underflow flag is set to “1,” new data is loaded from the reload
register, and count continues (auto-reload function).
FF16
n : Counter initial value
Count starts
Reload
Reload
n
1st underflow
2nd underflow
0016
Time
n+1 count
n+1 count
Timer 1 underflow flag
A skip instruction is executed.
Fig. 12 Auto-reload function
MITSUBISHI
ELECTRIC
10
MITSUBISHI [ Mitsubishi Group ]
