7540 datasheet(189/366 Pages) RENESAS

189 / 366 page

2-113

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPLICATION

2.6 Serial I/O1

Fig. 2.6.16 Setting method for UART of serial I/O1 (1)

(2) UART setting method

Figure 2.6.16 and Figure 2.6.17 show the setting method for UART of serial I/O1.

b7b0

1 0

b7b0

0 0

Interrupt control register 1 (ICON1) [Address 3E16]

Serial I/O1 receive interrupt disabled

Serial I/O1 transmit interrupt disabled

Process 1: Stop and initialize serial I/O.

Serial I/O1 control register (SIO1CON) [Address 1A16]

Transmit operation stop and initialization

Receive operation stop and initialization

BRG count source selected (set in internal clock selected)

0: f(XIN)

1: f(XIN)/4

Serial I/O1 synchronous clock selected (Note 1)

0: BRG output/16

1: External clock input/16

Transmit interrupt source selected

0: When transmit buffer has emptied

1: When transmit shift operation is completed

Transmit enable selected

0: Transmit disabled (at half-duplex communication receive)

1: Transmit enabled (at full-duplex communication) (Note 2)

Receive enable selected

0: Receive disabled (at half-duplex communication transmit)

1: Receive enabled (at full-duplex communication) (Note 2)

Clock asynchronous serial I/O

Serial I/O1 enabled (P10–P12 pins operate as serial I/O1 pins)(Note 3)

Serial I/O1 control register (SIO1CON) [Address 1A16]

Process 3: Set serial I/O1 control register.

Note 1: Setting of serial I/O1 synchronous clock selection bit is as follows;

“0”: P12 pin can be used as a normal I/O pin

“1”: P12 pin is used as an input pin for an external clock.

2: When data transmission is executed at the state that an external clock input is selected

as the synchronous clock, set “1” to the transmit enable bit while the SCLK1 is “H” state.

3: When clock asynchronous (UART) serial I/O is selected, P13 pin can be used as a

normal I/O pin.

Process 2: Disable serial I/O1 transmit/receive interrupt.

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