III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS

I/O Ports (P Ports)

Structure of I/O Port

The Peripheral Block contains 29 bits of I/O ports (P00 to P07, P10 to P16, P20 to P27, P30 to P35) that can be directed for input or output through the use of a program.

Figure 9.2 shows the structure of a typical I/O port.

Internal data bus

 

I/O control

VDDE

I/O control

 

signal

 

register

 

 

 

Peripheral circuit

 

 

I/O control

Function

 

 

 

 

select register

Pxx

Data

 

 

register

 

 

Peripheral circuit

 

 

output

 

 

 

 

VSS

Peripheral circuit input

Figure 9.2 Structure of I/O Port

I/O Port Pins

The I/O ports concurrently serve as the input/output pins for peripheral circuits, as shown in Table 9.3. Whether they are used as I/O ports or for peripheral circuits can be set bit-for-bit using a function select register. All pins not used for peripheral circuits can be used as general-purpose I/O ports.

Table 9.3 I/O Pins

Pin name

 

I/O

Pull-up

Function

Function select bit

P00/SIN0

 

I/O

–

I/O port / Serial IF Ch.0 data input

CFP00(D0)/P0 function select register(0x402D0)

P01/SOUT0

 

I/O

–

I/O port / Serial IF Ch.0 data output

CFP01(D1)/P0 function select register(0x402D0)

P02/#SCLK0

 

I/O

–

I/O port / Serial IF Ch.0 clock input/output

CFP02(D2)/P0 function select register(0x402D0)

P03/#SRDY0

 

I/O

–

I/O port / Serial IF Ch.0 ready input/output

CFP03(D3)/P0 function select register(0x402D0)

P04/SIN1/

 

I/O

–

I/O port / Serial IF Ch.1 data input /

CFP04(D4)/P0 function select register(0x402D0)

#DMAACK2

 

 

 

#DMAACK2 output (Ex)

CFEX4(D4)/Port function extension register(0x402DF)

P05/SOUT1/

 

I/O

–

I/O port / Serial IF Ch.1 data output /

CFP05(D5)/P0 function select register(0x402D0)

#DMAEND2

 

 

 

#DMAEND2 output (Ex)

CFEX5(D5)/Port function extension register(0x402DF)

P06/#SCLK1/

 

I/O

–

I/O port / Serial IF Ch.1 clock input/output /

CFP06(D6)/P0 function select register(0x402D0)

#DMAACK3

 

 

 

#DMAACK3 output (Ex)

CFEX6(D6)/Port function extension register(0x402DF)

P07/#SRDY1/

 

I/O

–

I/O port / Serial IF Ch.1 ready input/output /

CFP07(D7)/P0 function select register(0x402D0)

#DMAEND3

 

 

 

#DMAEND3 output (Ex)

CFEX7(D7)/Port function extension register(0x402DF)

P10/EXCL0/

 

I/O

–

I/O port / 16-bit timer 0 event counter input (I)

CFP10(D0)/P1 function select register(0x402D4)

T8UF0/DST0

∗

 

 

/ 8-bit timer 0 output (O) / DST0 output (Ex)

CFEX1(D1)/Port function extension register(0x402DF)

P11/EXCL1/

 

I/O

–

I/O port / 16-bit timer 1 event counter input (I)

CFP11(D1)/P1 function select register(0x402D4)

T8UF1/DST1

∗

 

 

/ 8-bit timer 1 output (O) / DST1 output (Ex)

CFEX1(D1)/Port function extension register(0x402DF)

P12/EXCL2/

 

I/O

–

I/O port / 16-bit timer 2 event counter input (I)

CFP12(D2)/P1 function select register(0x402D4)

T8UF2/DST2

∗

 

 

/ 8-bit timer 2 output (O) / DST2 output (Ex)

CFEX0(D0)/Port function extension register(0x402DF)

P13/EXCL3/

 

I/O

–

I/O port / 16-bit timer 3 event counter input (I)

CFP13(D3)/P1 function select register(0x402D4)

T8UF3/DPCO

∗

 

 

/ 8-bit timer 3 output (O) / DPCO output (Ex)

CFEX1(D1)/Port function extension register(0x402DF)

P14/FOSC1/

 

I/O

–

I/O port / Low-speed (OSC1) clock output /

CFP14(D4)/P1 function select register(0x402D4)

DCLK

∗

 

 

DCLK output (Ex)

CFEX0(D0)/Port function extension register(0x402DF)

P15/EXCL4/

 

I/O

–

I/O port / 16-bit timer 4 event counter input (I)

CFP15(D5)/P1 function select register(0x402D4)

#DMAEND0/

 

 

 

/ #DMAEND0 output (O) / Serial IF Ch.3 clock

 

#SCLK3

 

 

 

input/output

 

P16/EXCL5/

 

I/O

–

I/O port / 16-bit timer 5 event counter input (I)

CFP16(D6)/P1 function select register(0x402D4)

#DMAEND1/

 

 

 

/ #DMAEND1 output (O) / Serial IF Ch.3 data

 

SOUT3

 

 

 

output

 

(I): Input mode, (O): Output mode, (Ex): Extended function

∗: A 3-V system I/O voltage can only be used for the P10–P14 pins.

B-III-9-4

EPSON

S1C33L03 FUNCTION PART