4 PERIPHERAL CIRCUITS

Register name

Address

Bit

Name

Function

 

 

 

 

 

Setting

 

Init.

R/W

Remarks

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power control

0040180

D7

CLKDT1

System clock division ratio

CLKDT[1:0]

 

Division ratio

0

R/W

 

register

(B)

D6

CLKDT0

selection

 

1

 

1

 

 

 

 

1/8

0

 

 

 

 

 

 

 

 

1

 

0

 

 

 

 

1/4

 

 

 

 

 

 

 

 

 

0

 

1

 

 

 

 

1/2

 

 

 

 

 

 

 

 

 

0

 

0

 

 

 

 

1/1

 

 

 

 

 

D5

PSCON

Prescaler On/Off control

1

 

On

 

 

 

0

 

Off

1

R/W

 

 

 

D4–3

–

reserved

 

 

 

 

 

 

–

 

0

–

Writing 1 not allowed.

 

 

D2

CLKCHG

CPU operating clock switch

1

 

OSC3

 

 

0

 

OSC1

1

R/W

 

 

 

D1

SOSC3

High-speed (OSC3) oscillation On/Off

1

 

On

 

 

 

0

 

Off

1

R/W

 

 

 

D0

SOSC1

Low-speed (OSC1) oscillation On/Off

1

 

On

 

 

 

0

 

Off

1

R/W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Prescaler clock

0040181

D7–1

–

reserved

 

 

 

 

 

 

–

 

0

–

 

select register

(B)

D0

PSCDT0

Prescaler clock selection

1

 

OSC1

 

0

 

OSC3/PLL

0

R/W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clock option

0040190

D7–4

–

–

 

 

 

 

 

 

–

 

–

–

0 when being read.

register

(B)

D3

HLT2OP

HALT clock option

1

 

On

 

 

 

0

 

Off

0

R/W

 

 

 

D2

8T1ON

OSC3-stabilize waiting function

1

 

Off

 

 

 

0

 

On

1

R/W

 

 

 

D1

–

reserved

 

 

 

 

 

 

–

 

0

–

Do not write 1.

 

 

D0

PF1ON

OSC1 external output control

1

 

On

 

 

 

0

 

Off

0

R/W

 

 

 

 

 

 

 

 

 

Power control

004019E

D7

CLGP7

Power control register protect flag

Writing 10010110 (0x96)

0

R/W

 

protect register

(B)

D6

CLGP6

 

removes the write protection of

0

 

 

 

 

D5

CLGP5

 

the power control register

0

 

 

 

 

D4

CLGP4

 

(0x40180) and the clock option

0

 

 

 

 

D3

CLGP3

 

register (0x40190).

 

0

 

 

 

 

D2

CLGP2

 

Writing another value set the

0

 

 

 

 

D1

CLGP1

 

write protection.

 

0

 

 

 

 

D0

CLGP0

 

 

 

 

 

 

 

 

 

 

 

0

 

 

A-24

EPSON

S1C33L03 PRODUCT PART