SH7041A datasheet(260/923 Pages) RENESAS

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• Bit 19—Source Address Reload (RO): Selects whether to reload the source address initial

value during channel 2 transfer. This bit is valid only for channel 2. It always reads 0 for

CHCR0, CHCR1, and CHCR3, and cannot be modified.

Bit 19: RO

Description

Does not reload source address (initial value)

Reloads source address

• Bit 18—Request Check Level (RL): Selects whether to output DRAK notifying external

device of

DREQ received, with active high or active low. This bit is valid only for CHCR0 and

CHCR1. It always reads 0 for CHCR2 and CHCR3, and cannot be modified.

Bit 18: RL

Description

Output DRAK with active high (initial value)

Output DRAK with active low

• Bit 17—Acknowledge Mode (AM): In dual address mode, selects whether to output DACK in

the data write cycle or data read cycle. In single address mode, DACK is always output

irrespective of the setting of this bit. This bit is valid only for CHCR0 and CHCR1. It always

reads as 0 for CHCR2 and CHCR3, and cannot be modified.

Bit 17: AM

Description

Outputs DACK during read cycle (initial value)

Outputs DACK during write cycle

• Bit 16—Acknowledge Level (AL): Specifies whether to set DACK (acknowledge) signal

output to active high or active low. This bit is valid only with CHCR0 and CHCR1. It always

reads as 0 for CHCR2 and CHCR3, and cannot be modified.

Bit 16: AL

Description

Active high output (initial value)

Active low output

SH7041A Datasheet(PDF) 260 Page - Renesas Technology Corp