M34551 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

M34551

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTER

Renesas Electronics 

MITSUBISHI MICROCOMPUTERS

4551 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for

INFRARED REMOTE CONTROL TRANSMITTER

Table 10 Timer control registers

Timer control register W1

W13 Prescaler control bit

W12 Prescaler dividing ratio selection bit

W11

Timer 1 count source selection bits

W10

at reset : 00002

at power down : 00002

0 Stop (prescaler state initialized)

1 Operating

0 Instruction clock (INSTCK) divided by 4

1 Instruction clock (INSTCK) divided by 8

W11 W10

Count source

00

Prescaler output (ORCLK)

01

1 0 Carrier output (CARRY)

1 1 Carrier output divided by 2 (CARRY/2)

R/W

Timer control register W2

W23 Timer 2 count source selection bit

W22

Timer 2 count value selection bits

W21

W20 Timer 1 control bit

at reset : 10002

at power down : – – – 02

0 f(XCIN)

1 Prescaler output (ORCLK)

W22 W21

Count source

0 0 Underflow occur every 214 count

0 1 Underflow occur every 213 count

1 0 Not available

1 1 Not available

0 Stop (timer 1 state retained)

1 Operating

R/W

Timer control register W3

at reset : 002

at power down : state retained

R/W

W31 Timer LC count source selection bit

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

1 State clock (STCK)

W30 Timer LC control bit

0 Stop (timer LC state retained)

1 Operating

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

“–” represents state retained.

(1) Timer control registers

q Timer control register W1

Register W1 controls the count source of timer 1, the

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

Register W2 controls the count operation of timer 1 and

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

Register W3 controls the count operation and count source

of timer LC. Set the contents of this register through

register A with the TW3A instruction. The TAW3 instruction

can be used to transfer the contents of register W3 to

register A.

20

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