4551 datasheet(21/69 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

4551 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for

INFRARED REMOTE CONTROL TRANSMITTER

Table 10 Timer control registers

Prescaler control bit

Prescaler dividing ratio selection bit

Timer 1 count source selection bits

Timer control register W1

W13

W12

W11

W10

at reset : 00002

at power down : 00002

R/W

Stop (prescaler state initialized)

Operating

Instruction clock (INSTCK) divided by 4

Instruction clock (INSTCK) divided by 8

Count source

Prescaler output (ORCLK)

Carrier output (CARRY)

Carrier output divided by 2 (CARRY/2)

W11

W10

Timer control register W2

at reset : 10002

at power down : – – – 02

R/W

f(XCIN)

Prescaler output (ORCLK)

W23

W22

W21

W20

Timer 2 count source selection bit

Timer 2 count value selection bits

Timer 1 control bit

W22

W21

Count source

Underflow occur every 214 count

Underflow occur every 213 count

Not available

Stop (timer 1 state retained)

Operating

Timer control register W3

at reset : 002

at power down : state retained

R/W

Bit 3 of timer 2 is output (timer 2 count source divided by 16)

State clock (STCK)

Stop (timer LC state retained)

Operating

W31

W30

Timer LC count source selection bit

Timer LC control bit

Note: “R” represents read enabled, and “W” represents write enabled.

“–” represents state retained.

(1) Timer control registers

q Timer control register W1

frequency dividing ratio and count operation of prescaler.

Set the contents of this register through register A with

the TW1A instruction. The TAW1 instruction can be used

to transfer the contents of register W1 to register A.

q Timer control register W2

count operation and count source of timer 2. Set the

contents of this register through register A with the TW2A

instruction. The TAW2 instruction can be used to transfer

the contents of register W2 to register A.

q Timer control register W3

of timer LC. Set the contents of this register through

can be used to transfer the contents of register W3 to

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