7733 datasheet(851/940 Pages) RENESAS

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SERIAL I/O

7736 Group User’s Manual

8–5

8.4 Clock asynchronous serial I/O (UART) mode

Concerning section “8.4 Clock asynchronous serial I/O (UART) mode,” the 7736 Group differs from the 7733

Group in the following:

• Table 8.4.2

The other description is the same as that of the 7733 Group. Therefore, refer to part 1:

• “8.4 Clock asynchronous serial I/O (UART) mode” (page 8-44 in part 1)

Pin name

TxDi

(P83, P87, P93)

RxD0 (P82),

RxD1 (P86)

RxD2 (P92)

CLKi

(P81, P85, P91)

CTS0

/RTS0 (P80)

CTS1

/RTS1 (P84)

(Note)

CTS2

(P90)

Functions

Serial data output

Serial data input

Programmable I/O port

BRGi count source input

____

CTS

input

____

RTS

output

Programmable I/O port

____

CTS

input

Programmable I/O port

Method of selection

(They cannot be used as programmable I/O ports.)

Port P8 direction register’s corresponding bit = “0”

(It can be used as an input port when only transmission is performed.)

(It can be used as an output port when only transmission is performed.)

Internal/External clock selection bit = “0”

Internal/External clock selection bit = “1”

____ ____

CTS

/RTS enable bit = “0”

____ ____

CTS

/RTS function selection bit = “0”

____ ____

CTS

/RTS enable bit = “0”

____ ____

CTS

/RTS function selection bit = “1”

____ ____

CTS

/RTS enable bit = “1”

____

CTS

enable bit = “0”

____

CTS

enable bit = “1”

Table 8.4.2 Functions of I/O pins in UART mode

Port P8 direction register: Address 1416

Internal/External clock selection bit: Bit 3 at addresses 3016, 3816, and 6416

____ ____

CTS

/RTS enable bit: Bit 4 at addresses 3416 and 3C16

____ ____

CTS

/RTS function selection bit: Bit 2 at addresses 3416 and 3C16

____

CTS

enable bit: Bit 2 at addresses 6816

g Pin TxDi outputs “H” level while not transmitting after a UARTi’s operating mode is selected.

(Pin TxDi is in a floating state when N-channel open-drain output is selected.)

____

Note: The RTSi output function is not assigned for UART2.

8.4 Clock asynchronous serial I/O (UART) mode

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