Epson S1C33L03 manual 327

III PERIPHERAL BLOCK: LOW-SPEED (OSC1) OSCILLATION CIRCUIT

I/O Memory of Low-Speed (OSC1) Oscillation Circuit

Table 6.3 lists the control bits of the low-speed (OSC1) oscillation circuit.

Table 6.3

Control Bits of Low-Speed (OSC1) Oscillation Circuit

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

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

P1 function

00402D4

D7

–

reserved

–

–

–

0 when being read.

select register

(B)

D6

CFP16

P16 function selection

1

EXCL5

0

P16

0

R/W

#DMAEND1

D5

CFP15

P15 function selection

1

EXCL4

0

P15

0

R/W

#DMAEND0

D4

CFP14

P14 function selection

1

FOSC1

0

P14

0

R/W

Extended functions

(0x402DF)

D3

CFP13

P13 function selection

1

EXCL3

0

P13

0

R/W

T8UF3

D2

CFP12

P12 function selection

1

EXCL2

0

P12

0

R/W

T8UF2

D1

CFP11

P11 function selection

1

EXCL1

0

P11

0

R/W

T8UF1

D0

CFP10

P10 function selection

1

EXCL0

0

P10

0

R/W

T8UF0

Port function

00402DF

D7

CFEX7

P07 port extended function

1

#DMAEND3

0

P07, etc.

0

R/W

extension

(B)

D6

CFEX6

P06 port extended function

1

#DMAACK3

0

P06, etc.

0

R/W

register

D5

CFEX5

P05 port extended function

1

#DMAEND2

0

P05, etc.

0

R/W

D4

CFEX4

P04 port extended function

1

#DMAACK2

0

P04, etc.

0

R/W

D3

CFEX3

P31 port extended function

1

#GARD

0

P31, etc.

0

R/W

D2

CFEX2

P21 port extended function

1

#GAAS

0

P21, etc.

0

R/W

D1

CFEX1

P10, P11, P13 port extended

1

DST0

0

P10, etc.

1

R/W

function

DST1

P11, etc.

DPC0

P13, etc.

D0

CFEX0

P12, P14 port extended function

1

DST2

0

P12, etc.

1

R/W

DCLK

P14, etc.

A-1

B-III

OSC1

S1C33L03 FUNCTION PART EPSON B-III-6-5