III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS

A-1

I/O Memory of Input Ports

Table 9.2 shows the control bits of the input ports.

Table 9.2 Control Bits of Input Ports

 

Register name

Address

Bit

Name

Function

 

Setting

 

Init.

R/W

Remarks

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K5 function

00402C0

D7–5

–

reserved

 

 

–

 

–

–

0 when being read.

 

 

 

select register

(B)

D4

CFK54

K54 function selection

1

#DMAREQ3

 

0

K54

0

R/W

 

 

 

 

 

 

D3

CFK53

K53 function selection

1

#DMAREQ2

 

0

K53

0

R/W

 

 

 

 

 

 

D2

CFK52

K52 function selection

1

#ADTRG

 

0

K52

0

R/W

 

 

 

 

 

 

D1

CFK51

K51 function selection

1

#DMAREQ1

 

0

K51

0

R/W

 

 

 

 

 

 

D0

CFK50

K50 function selection

1

#DMAREQ0

 

0

K50

0

R/W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K5 input port

00402C1

D7–5

–

reserved

 

 

–

 

–

–

0 when being read.

 

 

 

data register

(B)

D4

K54D

K54 input port data

1

High

 

0

Low

–

R

 

 

 

 

 

 

D3

K53D

K53 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

D2

K52D

K52 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

D1

K51D

K51 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

D0

K50D

K50 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K6 function

00402C3

D7

CFK67

K67 function selection

1

AD7

 

0

K67

0

R/W

 

 

 

 

select register

(B)

D6

CFK66

K66 function selection

1

AD6

 

0

K66

0

R/W

 

 

 

 

 

 

D5

CFK65

K65 function selection

1

AD5

 

0

K65

0

R/W

 

 

 

 

 

 

D4

CFK64

K64 function selection

1

AD4

 

0

K64

0

R/W

 

 

 

 

 

 

D3

CFK63

K63 function selection

1

AD3

 

0

K63

0

R/W

 

 

 

 

 

 

D2

CFK62

K62 function selection

1

AD2

 

0

K62

0

R/W

 

 

 

 

 

 

D1

CFK61

K61 function selection

1

AD1

 

0

K61

0

R/W

 

 

 

 

 

 

D0

CFK60

K60 function selection

1

AD0

 

0

K60

0

R/W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K6 input port

00402C4

D7

K67D

K67 input port data

1

High

 

0

Low

–

R

 

 

 

 

data register

(B)

D6

K66D

K66 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

D5

K65D

K65 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

D4

K64D

K64 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

D3

K63D

K63 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

D2

K62D

K62 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

D1

K61D

K61 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

D0

K60D

K60 input port data

 

 

 

 

 

–

R

 

 

 

 

 

 

B-III

CFK54–CFK50: K5[4:0] function selection (D[4:0]) / K5 function select register (0x402C0)

 

 

CFK67–CFK60: K6[7:0] function selection (D[7:0]) / K6 function select register (0x402C3)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Selects the function of each input-port pin.

Write "1":

Used for peripheral circuit

 

Write "0":

Input port pin

 

Read:

Invalid

 

When a bit of the CFK register is set to "1", the corresponding pin is set for use with the peripheral circuit (see

 

Table 9.1). The pins for which register bits are set to "0" can be used as general-purpose input ports.

 

At cold start, CFK is set to "0" (input port). At hot start, CFK retains its state from prior to the initial reset.

 

 

 

 

I/O

K54D–K50D: K5[4:0] input port data (D[4:0]) / K5 input port data register (0x402C1)

K67D–K60D: K6[7:0] input port data (D[7:0]) / K6 input port data register (0x402C4)

 

 

 

 

The input data on each input port pin can be read from this register.

 

Read "1": High level

 

Read "0": Low level

 

Write:

Invalid

 

The pin voltage of each input port can be read out "1" directly when the voltage is high (VDD) or "0" when the voltage is low (VSS) respectively.

Since this register is a read-only register, writing to the register is ignored.

When the ports set for A/D converter input are read, the value obtained is always "0".

S1C33L03 FUNCTION PART

EPSON

B-III-9-3