HD6433636SW datasheet(229/418 Pages) RENESAS

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Table 10.3

SCI1 Registers

Name

Abbrev.

R/W

Initial Value

Address

Serial control register 1

SCR1

R/W

H'00

H'FFA0

Serial control status register 1

SCSR1

R/W

H'9C

H'FFA1

Serial data register U

SDRU

R/W

Undefined

H'FFA2

Serial data register L

SDRL

R/W

Undefined

H'FFA3

10.2.2

Serial Control Register 1 (SCR1)

Bit

76543210

SNC1

SNC0

—

CKS3

CKS2

CKS1

CKS0

Initial value

00000000

Read/Write

R/W

SCR1 is an 8-bit read/write register for selecting the operation mode, the transfer clock source,

and the prescaler division ratio.

Upon reset, SCR1 is initialized to H'00. Writing to this register stops a transfer in progress.

Bits 7 and 6—Operation Mode Select 1, 0 (SNC1, SNC0): Bits 7 and 6 select the operation

mode.

Bit 7: SNC1

Bit 6: SNC0

Description

8-bit synchronous transfer mode

(initial value)

16-bit synchronous transfer mode

Continuous clock output mode*

Reserved*

Notes: 1. Pins SI

1 and SO1 should be used as general input or output ports.

2. Don’t set bits SNC1 and SNC0 to 11.

Bits 5 and 4—Reserved Bits: Bits 5 and 4 are reserved: they should always be cleared to 0.

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