3819 datasheet(100/218 Pages) RENESAS

100 / 218 page

2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.3 Serial I/O

3819 Group USER’S MANUAL

2.3 Serial I/O

2.3.1 Related registers

Fig. 2.3.1 Structure of Serial I/O automatic transfer data pointer

Fig. 2.3.2 Structure of Serial I/O 1 control register

When an external clock is selected in the serial I/O 1 automatic transfer

mode, the S RDY1 signal pin is used as the CS signal input pin.

Serial I/O automatic transfer data pointer

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Serial I/O automatic transfer data pointer (SIODP) [Address:1816]

Nothing is allocated for these bits. These are write disabled bits.

When these bits are read out, the values are "0."

Indicate an address of Serial I/O automatic transfer RAM.

Serial I/O 1 control register

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Serial I/O 1 control register (SIO1CON) [Address:1916]

Name

Internal synchronous clock

selection bits

Synchronous clock selection

bit

000 : f(XIN)/8 or f(XCIN)/8

001 : f(XIN)/16 or f(XCIN)/16

010 : f(XIN)/32 or f(XCIN)/32

011 : f(XIN)/64 or f(XCIN)/64

110 : f(XIN)/128 or f(XCIN)/128

111 : f(XIN)/256 or f(XCIN)/256

0 : External clock

1 : Internal clock

P65/SOUT1 P-channel output

disable bit

b2 b1b0

Serial I/O 1 port selection bit

(P65,P66,P67 )

Transfer direction selection

bit

0 : LSB first

1 : MSB first

SRDY1 output selection bit

(P67)

0 : I/O port

1 : SRDY1/CS signal pin

( Note)

0 : I/O port

1 : SOUT1, SCLK11, SCLK12 signal pins

Valid only in the Serial I/O automatic transfer mode

0 : CMOS output (in output mode)

1 : N-channel open-drain output

(in output mode)

Note :

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