HD6475348R Datasheet, PDF(271/487 Page) Hitachi Semiconductor – Single-Chip Microcomputer

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HD6475348R Datasheet, PDF (271/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

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14.1.3 Input and Output Pins

Table 14-1 lists the input and output pins used by the SCI module.

Table 14-1 SCI Input/Output Pins

Channel

1

2

Name

Serial clock

Receive data

Transmit data

Serial clock

Receive data

Transmit data

Abbreviation

SCK1

RXD1

TXD1

SCK2

RXD2

TXD2

I/O

Input/output

Input

Output

Input/output

Input

Output

Function

Serial clock input and output.

Receive data input.

Transmit data output.

Serial clock input and output.

Receive data input.

Transmit data output.

14.1.4 Register Configuration

Table 14-2 lists the SCI registers.

Table 14-2 SCI Registers

Channel Name

Abbreviation R/W

Initial Value

1

Receive shift register RSR

â

â

Receive data register RDR

R

H'00

Transmit shift register TSR

â

â

Transmit data register TDR

R/W

H'FF

Serial mode register

SMR

R/W

H'04

Serial control register SCR

R/W

H'0C

Serial status register SSR

R/(W)* H'87

Bit rate register

BRR

R/W

H'FF

2

Receive shift register RSR

â

â

Receive data register RDR

R

H'00

Transmit shift register TSR

â

â

Transmit data register TDR

R/W

H'FF

Serial mode register

SMR

R/W

H'04

Serial control register SCR

R/W

H'0C

Serial status register SSR

R/(W)* H'87

Bit rate register

BRR

R/W

H'FF

* Software can write a 0 to clear the status flag bits, but cannot write a 1.

Address

â

H'FEDD

â

H'FEDB

H'FED8

H'FEDA

H'FEDC

H'FED9

â

H'FEF5

â

H'FEF3

H'FEF0

H'FEF2

H'FEF4

H'FEF1

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