M34282E2GP MITSUBISHI [Mitsubishi Electric Semiconductor], M34282E2GP Datasheet - Page 12

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M34282E2GP

Manufacturer Part Number
M34282E2GP
Description
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
Manufacturer
MITSUBISHI [Mitsubishi Electric Semiconductor]
Datasheets

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Note: “W” represents write enabled.
(1) Control registers related to timer
(2) Precautions
12
Table 4 Control registers related to timer
• Timer control register V1
• Timer control register V2
• Count source
• Watchdog timer
• Writing to reload register R1
• Timer 1 count operation
• Stop of timer 2
• Writing to reload register R2H
• Timer 2 carrier wave output function
V1
V1
V1
V1
V1
V1
V1
Note the following for the use of timers.
Register V1 controls the timer 1 count source and auto-
control function of carrier wave output from port CARR by
timer 1. Set the contents of this register through register A
with the TV1A instruction.
Register V2 controls the timer 2 count source and the carrier
wave generation function by timer. Set the contents of this
register through register A with the TV2A instruction.
Stop timer 1 or timer 2 counting to change its count source.
Be sure that the timing to execute the WRST instruction in
order to operate WDT efficiently.
When writing data to reload register R1 while timer 1 is
operating, avoid a timing when timer 1 underflows.
When the bit 5 of the watchdog timer (WDT) is selected as
the timer 1 count source, the error of maximum ± 256 s
(at the minimum instruction execution time : 8
generated from timer 1 start until timer 1 underflow. When
programming, be careful about this error.
Avoid a timing when timer 2 underflows to stop timer 2.
When writing data to reload register R2H while timer 2 is
operating, avoid a timing when timer underflows.
When to expand “H” interval of carrier wave is valid, set “1”
or more to reload register R2H.
3
2
1
0
2
1
0
Carrier wave “H” interval expansion bit
Carrier wave generation function control bit
Timer 2 count source selection bit
Timer 2 control bit
Carrier wave output auto-control bit
Timer 1 count source selection bit
Timer 1 control bit
Timer control register V1
Timer control register V1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
s) is
MITSUBISHI
ELECTRIC
at reset : 0000
at reset : 000
To expand “H” interval is invalid
To expand “H” interval is valid (when V2
Carrier wave generation function invalid
Carrier wave generation function valid
f(X
f(X
Stop (Timer 2 state retained)
Operating
Auto-control output by timer 1 is invalid
Auto-control output by timer 1 is valid
Carrier wave output (CARRY)
Bit 5 of watchdog timer (WDT)
Stop (Timer 1 state retained)
Operating
IN
IN
)
)/2
2
2
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
at RAM back-up : 0000
at RAM back-up : 000
2
=1 selected)
4282 Group
2
2
W
W

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