7480 datasheet(128/337 Pages) RENESAS

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7480 Group and 7481 Group User's Manual

1-111

1.14 Serial I/O

HARDWARE

(3)

Serial I/O Control Register

This register controls the selection of a transmit/receive mode, a synchronous clock, serial I/O pin

functions, etc. of serial I/O.

Figure 1.14.4 shows the serial I/O control register.

Figure 1.14.4 Serial I/O Control Register

Serial I/O control register

b4 b3 b2 b1 b0

Name

Function

At reset

Serial I/O control register (SIOCON) [Address 00E216]

BRG count source

selection bit (CSS)

0 : f(XIN)/4

1 : f(XIN)/16

Serial I/O synchronous

clock selection bit (SCS)

when clock synchronous serial I/O is selected

0 : BRG output/4

1 : External clock input

when UART is selected

0 : BRG output/16

1 : External clock input/16

Transmit interrupt source

selection bit (TIC)

Transmit enable bit

(TE)

Receive enable bit

(RE)

Serial I/O mode selection bit

(SIOM)

Serial I/O enable bit

(SIOE)

0 : Interrupt occurs when transmit

buffer is empty.

1 : Interrupt occurs when transmit shift

operation is completed.

0 : Transmit disabled

1 : Transmit enabled

0 : Receive disabled

1 : Receive enabled

0 : Asynchronous serial I/O (UART)

1 : Clock synchronous serial I/O

0 : Serial I/O disabled

1 : Serial I/O enabled

SRDY output enable bit

(SRDY)

0 : P17 pin

1 : SRDY output pin

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