M306V2EEFS datasheet(99/271 Pages) RENESAS

99 / 271 page

Rev.1.40

Oct 06, 2004 page 99 of 269

M306V2ME-XXXFP, M306V2EEFP

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

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

3: Only when UART mode.

4: Using for SIM interface.

UART0

UART2

Function

CLK polarity selection

Continuous receive mode selection

LSB first / MSB first selection

Impossible

Transfer clock output from multiple

pins selection

Impossible

Serial data logic switch

Sleep mode selection

Impossible

TxD, RxD I/O polarity switch

Possible

CMOS output

TxD, RxD port output format

N-channel open-drain

output

Impossible

Parity error signal output

Impossible

Bus collision detection

Possible

(Note 1)

Possible

(Note 1)

Possible

(Note 1)

Possible

(Note 3)

Possible

(Note 1)

Possible

(Note 2)

Possible

(Note 1)

Possible

(Note 4)

Possible

(Note 4)

Table 2.11.1 Comparison of functions of UART0 and UART2

2.11 Serial I/O

Serial I/O is configured as 4 unites: UART0, UART2, multi-master I2C-BUS interface 0, and multi-master

I2C-BUS interface 1.

2.11.1 UART0 and UART2

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

dently of each other.

Figure 2.11.1 shows the block diagram of UART0 and UART2. Figures 2.11.2 and 2.11.3 show the block

diagram of the transmit/receive unit.

UARTi (i = 0 and 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

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 and UART2 have almost the same functions.

UART0 and UART2 are almost equal in their functions with minor exceptions. UART2, in particular, is

compliant with the SIM interface. It also has the bus collision detection function that generates an interrupt

request if the TxD pin and the RxD pin are different in level.

Table 2.11.1 shows the comparison of functions of UART0 and UART2, and Figures 2.11.4 to 2.11.14

show the registers related to UARTi.

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