M16CSLASH26 datasheet(114/239 Pages) RENESAS

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Serial I/O

108

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Serial I/O

Serial I/O is configured as three channels: UART0, UART1, and UART2.

UARTi (i = 0 to 2)

UART0, UART1 and UART2 each have an exclusive timer to generate a transfer clock, so they operate

independently of each other.

Figure 1.15.1 shows the block diagram of UART0, UART1 and UART2. Figures 1.15.2 and 1.15.3 show

the block diagram of the transmit/receive unit.

UARTi (i = 0 to 2) has two operation modes: a clock synchronous serial I/O mode and a clock asynchronous

serial I/O mode (UART mode). The contents of the serial I/O mode select bits (bits 0 to 2 at addresses

03A016, 03A816 and 037816) determine whether UARTi is used as a clock synchronous serial I/O or as a

UART. Although a few functions are different, UART0, UART1 and UART2 have almost the same functions.

UART2, in particular, is used for the SIM (Subscriber Identity Module) interface with some extra settings

added in clock-asynchronous serial I/O mode.

Table 1.15.1 shows the comparison of functions of UART0 through UART2, and Figures 1.15.4 to 1.15.10

show the registers related to UARTi.

Note 1: Only when in clock synchronous serial I/O mode.

Note 2: Only when in clock synchronous serial I/O mode and 8-bit UART mode.

UART0

UART1

UART2

Function

CLK polarity selection

Continuous receive mode selection

LSB first / MSB first selection

Not Supported

Transfer clock output from multiple

pins selection

Not Supported

Serial data logic switch

TxD, RxD I/O polarity switch

CMOS output/Nch OD

TxD, RxD port output format

N-channel open-drain

output

Parity error signal output

Bus collision detection

Supported

(Note 1)

CMOS output/Nch OD

(Note 1)

Supported

(Note 1)

Supported

(Note 1)

Supported

(Note 1)

Supported

(Note 1)

Supported

(Note 1)

Supported

(Note 1)

Supported

(Note 1)

Supported

(Note 2)

Supported (Note 3)

Supported

(Note 3)

Not Supported

Supported

Note 3: Used for SIM interface.

Table 1.15.1. Comparison of functions of UART0 through UART2

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