R8CSLASH29 datasheet(254/471 Pages) RENESAS

254 / 471 page

R8C/28 Group, R8C/29 Group

15. Serial Interface

Rev.2.10

Sep 26, 2008

Page 237 of 441

REJ09B0279-0210

Figure 15.7

Registers PINSR1 and PMR

Pin Select Register 1

Symbol

Address

After Reset

PINSR1

00F5h

00h

Bit Symbol

Bit Name

Function

NOTE:

1. The UART1 pins can be selected by using bits TXD1SEL and TXD1EN in the PMR register.

—

(b2)

—

(b7-b3)

Set to 1. When read, the content is 0.

Set to 0. When read, the content is 0.

Reserved bits

Reserved bit

UART1SEL1

UART1SEL0

0000

b7 b6 b5 b4 b3 b2

b1 b0

0 0 : P3_7(TXD1/RXD1)

0 1 : P3_7(TXD1), P4_5(RXD1)

1 0 : Do not set.

1 1 : Do not set.

TXD1/RXD1 pin select bit(1)

Port Mode Register

Symbol

Address

After Reset

PMR

00F8h

00h

Bit Symbol

Bit Name

Function

NOTE:

1. The UART1 pins can be selected by using bits TXD1SEL and TXD1EN, and bits UART1SEL1 and UART1SEL0 in the

PINSR1 register.

IICSEL

SSU / I2C bus pin sw itch bit

0 : Selects SSU function

1 : Selects I2C bus function

TXD1EN

TXD1/RXD1 select bit(1)

0 : RXD1

1 : TXD1

TXD1SEL

Port/TXD1 pin sw itch bit(1)

0 : Programmable I/O port

1 : TXD1

U1PINSEL

TXD1 pin sw itch bit(1)

Set to 1 to use UART1.

SSISEL

SSI pin select bit

0 : P3_3

1 : P1_6

—

(b0)

Set to 0.

—

(b2-b1)

—

Reserved bit

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

b3 b2 b1

b7 b6 b5 b4

PINSR1 Register

UART1SEL1,

UART1SEL0 bit

TXD1SEL bit

TXD1EN bit

P3_7(TXD1)

P3_7(RXD1)

P3_7(TXD1)

P4_5(RXD1)

×: 0 or 1

Pin Function

00b

01b

PMR Register

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