M38C31M7AXXXFS datasheet(98/224 Pages) RENESAS

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38C3 Group User’s Manual

APPLICATION

2-33

2.3 Serial I/O

This paragraph explains the registers setting method and the notes relevant to the serial I/O.

2.3.1 Memory map

Fig. 2.3.1 Memory map of registers relevant to Serial I/O

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

2.3.2 Relevant registers

001B16

003C16

003D16

003E16

Serial I/O register (SIO)

Interrupt request register 1 (IREQ1)

Interrupt control register 1 (ICON1)

001A16

001916 Serial I/O control register 1 (SIOCON1)

Serial I/O control register 2 (SIOCON2)

Serial I/O control register 1

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O control register 1

(SIOCON1: address 1916)

Name

Functions

At reset R W

3 Serial I/O port

selection bit

(P40, P45, P46)

SRDY output

selection bit (P47)

0: I/O port

1: SRDY signal pin

0: LSB first

1: MSB first

0: External clock

1: Internal clock

Transfer direction

selection bit

Synchronous clock

selection bit

P-channel output

disable bit

(P40, P45, P46)

0: I/O port

1: SOUT, SCLK1, SCLK2

signal pin

0 0 0: f(XIN)/8 or f(XCIN)/8

0 0 1: f(XIN)/16 or f(XCIN)/16

0 1 0: f(XIN)/32 or f(XCIN)/32

0 1 1: f(XIN)/64 or f(XCIN)/64

1 1 0: f(XIN)/128 or f(XCIN)/128

1 1 1: f(XIN)/256 or f(XCIN)/256

0: CMOS output

(in output mode)

1: N-channel open-drain

output (in output mode)

b2b1b0

Internal

synchronous clock

selection bits

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