M30620FCAFP datasheet(423/615 Pages) RENESAS

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SI/O3, 4

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-106

Figure 2.6.1. Memory map of serial I/O3, 4-related registers

2.6.1 Overview of the SI/O3,4 usage

SI/O3, 4 carries out 8-bit data communications in synchronization with the clock. The following is an

overview of the SI/O3, 4 usage.

(1) Transmission/reception format

8-bit data

(2) Transfer rate

If the internal clock is selected as the transfer clock, the divide-by-2 frequency, resulting from the bit

rate generator division, becomes the transfer rate. The bit rate generator count source can be se-

lected from the following: f1, f8, and f32. Clocks f1, f8, and f32 are derived by dividing the CPU’s main

clock by 1, 8, and 32 respectively.

Furthermore, if an external clock is selected as the transfer clock, the clock frequency input to the CLK

pin becomes the transfer rate.

(3) Function selection

For SI/O3, 4, the following functions can be selected:

(a) Function for choosing which bit to transmit first

This function is to choose whether to transmit data from bit 0 or from bit 7. Choose either of the

following:

• LSB first

Data is transmitted from bit 0.

• MSB first

Data is transmitted from bit 7.

(b) Choosing output level when not transferring

• Internal clock

High-impedance output.

• External clock

"H" or "L" output level is selected.

(6) Input to the serial I/O and the direction register

To input an external signal to the serial I/O, set the direction register of the relevant port to input.

(7) Pins related to the SI/O3, 4

• CLK3, CLK4 pins

Input/output pins for the transfer clock

• SIN3, SIN4 pins

Input pins for data

• SOUT3, SOUT4 pins

Output pins for data

(8) Registers related to the SI/O3, 4

Figure 2.6.1 shows the memory map of SI/O3, 4-related registers, and Figures 2.6.2 show SI/O3, 4-

related registers.

2.6 SI/O3, 4 Usage

004816

004916

SI/O4 interrupt control register (S4IC)

SI/O3 interrupt control register (S3IC)

SI/O3 transmit/receive register (S3TRR)

036016

036116

036216

036316

036416

036516

036616

036716

SI/O3 transmit/receive control register (S3C)

SI/O3

bit rate generator (S3BRG)

SI/O4 transmit/receive register (S4TRR)

SI/O4 control register (S4C)

SI/O4

bit rate generator (S4BRG)

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