7906 datasheet(277/531 Pages) RENESAS

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SERIAL I/O

7906 Group User’s Manual Rev.2.0

11-36

11.4 Clock asynchronous serial I/O (UART) mode

Table 11.4.1 lists the performance overview in the UART mode, and Table 11.4.2 lists the functions of

I/O pins in this mode.

Table 11.4.1 Performance overview in UART mode

Item

Transfer data

format

Transfer rate

Error detection

Start bit

Character bit (Transfer data)

Parity bit

Stop bit

When selecting internal clock

When selecting external clock

Functions

1 bit

7 bits, 8 bits, or 9 bits

0 bit or 1 bit (Odd or Even can be selected.)

1 bit or 2 bits

BRGi’s output divided by 16

Maximum 312.5 kbps

4 types (overrun, framing, parity, and summing): presence of an

error can be detected only by check of the error sum flag.

Table 11.4.2 Functions of I/O pins in UART mode

Method of selection

TxD0/P13 or TxD1/P17 switch bit = “0.” (Note)

TxD0/P13 or TxD1/P17 switch bit = “1.”

Port P1 direction register’s corresponding bit = “0”

– (Can be used as a programmable I/O port pin when

performing only transmission.)

Internal/External clock select bit = “1”

Internal/External clock select bit = “0”

See Table 11.2.1.

Pin name

TxDi (P13, P17)

RxDi (P12, P16)

CLKi (P11, P15)

CTSi

/ RTSi (P10, P11,

P14, P15)

Functions

Serial data output pin

Programmable I/O port pin

Serial data input pin

Programmable I/O

port pin

BRGi’s count source input pin

Programmable I/O port pin

CTS input pin

RTS output pin

Programmable I/O port pin

Port P1 direction register: address 0516

Internal/External clock select bit: bit 3 at addresses 3016, 3816

TxD0/P13 switch bit: bit 2 at address AC16

TxD1/P17 switch bit: bit 3 at address AC16

Note: The TxDi pin outputs “H” level while transmission is not performed after the UARTi’s operating mode

is selected.

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