4551 datasheet(59/69 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

4551 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for

INFRARED REMOTE CONTROL TRANSMITTER

CONTROL REGISTERS

V13

V12

V11

V10

Timer 2 interrupt enable bit

Timer 1 interrupt enable bit

Not used

External 0 interrupt enable bit

Interrupt disabled (SNZT2 instruction is valid)

Interrupt enabled (SNZT2 instruction is invalid)

Interrupt disabled (SNZT1 instruction is valid)

Interrupt enabled (SNZT1 instruction is invalid)

This bit has no function, but read/write is enabled.

Interrupt disabled (SNZ0 instruction is valid)

Interrupt enabled (SNZ0 instruction is invalid)

Interrupt control register V1

at reset : 00002

at power down : 00002

R/W

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.

4551 Datasheet(PDF) 59 Page - Renesas Technology Corp

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