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NJU3504FA1

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3504

• TIMER1 / PRESCALER CONTROL REGISTER {PHY3 ; (Y'=3, Peripheral register table 0)}

[Writing to the Timer1 / Prescaler Control Register]

(MSB) 3

2

1

0 (LSB)

PHY3

−

Start control

Operation mode

Prescaler control

/ 1:Start

/ 0:Single mode, 1:Repeat mode

/ 0:On, 1:Off

EX.)An example of the start procedure in the single mode and the internal clock operation.

SRPC

LDI

LDI

TAP

LDI

TAP

:

:

Y,3

A,%0000

A,%0001

:

:

;

;PHY3(Timer1/Prescaler Control Register) is pointed.

;"0000"(BIN) is stored to accumulator

Single mode,

;Data is transferred from accumulator to PHY3

Prescaler is enable

;"0001"(BIN) is stored to accumulator

;Data is transferred from accumulator to PHY3

The count is started.

Remarks) When the prescaler generating the internal count clock is stopped the operation, Timer is also stopped.

But the data in the counter is kept. Therefore Timer can continue to count from the kept condition of

the counter when the prescaler is started the operation again. However, the clocks from the prescaler

are delivered to Serial I/O, CKOUT terminal and A/D converter controller , therefore the prescaler

requires careful operation, especially stop or start.

When the prescaler is started the operation again after it was stopped, it is reset and start to count from

“zero”.

[Reading from the Timer1 / Prescaler Control Register]

(MSB) 3

2

1

0 (LSB)

PHY3

“0”

Overflow flag

Operation mode

Prescaler control

/ 1:Overflow

/ 0:Single mode, 1:Repeat mode

/ 0:On, 1:Off

EX.)An example of the overflow in the single mode and the internal clock operation.(The data of the Timer1 /

Prescaler Control Register is "0001"(BIN).)

:

:

SRPC

LDI

Y,3

TPA

:

:

;

;PHY3(Timer1/Prescaler Control Register) is pointed.

;"0001"(BIN) of PHY3 is transferred to accumulator.

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