HD6433713 datasheet(202/324 Pages) RENESAS

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11.2 Register Descriptions

11.2.1 Start Address Register (STAR)

STAR is an 8-bit read/write register, for designating the transfer start address in the memory area

from H'FF80 to H'FF9F allocated to the 32-byte data buffer.

The 32 bytes from H'00 to H'1F designated by the lower 5 bits of STAR (bits STA4 to STA0)

correspond to addresses H'FF80 to H'FF9F.

Data is sent or received continuously using the area defined in STAR and in the end address

Bits 7 to 5 are reserved; they always read 1, and cannot be modified.

Upon reset, STAR is initialized to H'E0.

11.2.2 End Address Register (EDAR)

EDAR is an 8-bit read/write register, for designating the transfer end address in the memory area

from H'FF80 to H'FF9F allocated to the 32-byte data buffer.

The 32 bytes from H'00 to H'1F designated by the lower 5 bits of EDAR (bits EDA4 to EDA0)

correspond to addresses H'FF80 to H'FF9F.

Data is sent or received continuously using the area defined in STAR and EDAR. If the same

value is designated in both STAR and EDAR, only one byte of data is transferred.

Bits 7 to 5 are reserved; they always read 1, and cannot be modified.

Upon reset, EDAR is initialized to H'E0.

Bit

Initial value

Read/Write

—

STA4

R/W

STA3

R/W

STA0

R/W

STA2

R/W

STA1

R/W

Bit

Initial value

Read/Write

—

EDA4

R/W

EDA3

R/W

EDA0

R/W

EDA2

R/W

EDA1

R/W

191

HD6433713 Datasheet(PDF) 202 Page - Renesas Technology Corp

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