Renesas PCA4738L-64A Technical Information PDF herunterladen (Seite 25)

MITSUBISHI MICROCOMPUTERS

3802 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Serial I/O2

The serial I/O2 function can be used only for clock synchronous

serial I/O.

For clock synchronous serial I/O the transmitter and the receiver

must use the same clock. If the internal clock is used, transfer is

started by a write signal to the serial I/O2 register.

Serial I/O2 control register (SIO2CON) 001D16

The serial I/O2 control register contains seven bits which control

various serial I/O functions.

Fig. 15 Structure of serial I/O2 control register

Fig. 16 Block diagram of serial I/O2 function

"1"

"0"

"1"

"0"

"1"

RDY2

CLK2

"0"

"1"

1/8

1/16

1/32

1/64

1/128

1/256

Data bus

Serial I/O2

interrupt request

Serial I/O2 port selection bit

Serial I/O counter 2 (3)

Serial I/O shift register 2 (8)

Synchronization circuit

Serial I/O2 port selection bit

Serial I/O2 synchronous

clock selection bit

RDY2

output enable bit

External clock

Internal synchronous

clock selection bits

Divider

latch

RDY2

CLK2

OUT2

IN2

latch

Serial I/O2 control register

(SIO2CON : address 001D

)

Internal synchronous clock selection bits

0 0 0: f(X

)/8

0 0 1: f(X

)/16

0 1 0: f(X

)/32

0 1 1: f(X

)/64

1 1 0: f(X

)/128

1 1 1: f(X

)/256

Serial I/O2 port selection bit (SM2

)

0: I/O port

1: S

OUT2

CLK2

output pin

RDY2

output enable bit (SM2

)

0: I/O port

1: S

RDY2

output pin

Transfer direction selection bit (SM2

)

0: LSB first

1: MSB first

Serial I/O2 synchronous clock selection bit (SM2

)

0: External clock

1: Internal clock

OUT2

P-channel output disable bit

0: CMOS output (in output mode)

1: N-channel open-drain output (in output mode)

b2 b1 b0

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 53 54

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