Epson S1C33L03 User Manual

III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS

S1C33L03 FUNCTION PART

EPSON

B-III-9-3

A-1

B-III

I/O

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

Name

Address

Register name

Bit

Function

Setting

Init.

R/W

Remarks

–

CFK54

CFK53

CFK52

CFK51

CFK50

D7–5

reserved

K54 function selection

K53 function selection

K52 function selection

K51 function selection

K50 function selection

–

R/W

0 when being read.

00402C0

(B)

1 #DMAREQ3 0 K54

1 #DMAREQ2 0 K53

1 #ADTRG

0 K52

1 #DMAREQ1 0 K51

1 #DMAREQ0 0 K50

K5 function

select register

–

K54D

K53D

K52D

K51D

K50D

D7–5

reserved

K54 input port data

K53 input port data

K52 input port data

K51 input port data

K50 input port data

–

0 when being read.

00402C1

(B)

1 High

0 Low

K5 input port

data register

CFK67

CFK66

CFK65

CFK64

CFK63

CFK62

CFK61

CFK60

K67 function selection

K66 function selection

K65 function selection

K64 function selection

K63 function selection

K62 function selection

K61 function selection

K60 function selection

R/W

00402C3

(B)

1 AD7

0 K67

1 AD6

0 K66

1 AD5

0 K65

1 AD4

0 K64

1 AD3

0 K63

1 AD2

0 K62

1 AD1

0 K61

1 AD0

0 K60

K6 function

select register

K67D

K66D

K65D

K64D

K63D

K62D

K61D

K60D

K67 input port data

K66 input port data

K65 input port data

K64 input port data

K63 input port data

K62 input port data

K61 input port data

K60 input port data

–

00402C4

(B)

1 High

0 Low

K6 input port

data register

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.

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 (V

) or "0" when the

voltage is low (V

) 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".