7477 datasheet(152/354 Pages) RENESAS

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1-135

7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.13 Serial I/O

(3) Serial I/O control register (SIOCON: Address 00E216)

The Serial I/O control register exerts various types of control over the serial I/O, for example, transfer

mode, clocks and pin function selection. All the bits of this register can be read and written by

software.

Figure 1.13B.15 shows a structure of the Serial I/O control register.

Fig. 1.13B.15 Structure of Serial I/O control register

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O control register (SIOCON) [Address

At reset

Serial I/O control register (7477/7478 group)

Name

Function

BRG count source

selection bit (CSS)

0 : f(XIN)/4

1 : f(XIN)/16

Serial I/O

synchronous clock

selection bit (SCS)

Transmit interrupt

source selection

bit (TIC)

Transmit enable bit (TE)

Receive enable bit (RE)

Serial I/O enable

bit (SIOE)

Serial I/O mode

selection bit (SIOM)

SRDY output enable

bit (SRDY)

VIn the UART mode,

this bit is invalid.

•In clock synchronous mode

0 : BRG output divided by 4

1 : External clock input

•In UART mode

0 : BRG output divided by 16

1 : External clock input

divided by 16

0 : P17/SRDY pin operates

as ordinary I/O pin

1 : P17/SRDY pin operates

as SRDY output pin

0 : When transmit buffer

has emptied

1 : When transmit shift

operation is completed

0 : Transmit disabled

1 : Transmit enabled

0 : Receive disabled

1 : Receive enabled

0 : Clock asynchronous

serial I/O (UART)

1 : Clock synchronous

0 : Serial I/O disabled

(pins operates as ordinary

I/O pins P14–P17)

1 : Serial I/O enabled

(pins operates as serial

I/O pins RXD - SRDY)

(Note 2)

Notes 1:

Port P14–P17 are operates as the serial I/O pin only when

the serial I/O enable bit is “1” (enable state).

At this time, Port P1 7 is also used as an ordinary I/O port.

In the UART mode, port P1 6 is used as an ordinary I/O port

when the internal clock is selected.

00E216]

(Note 1)

In the 7478 Group, f(X

)/4 (at “0”), f(X

)/16 (at “1”) can

be also selected.

CIN

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