Renesas H8S/2111B Manual do Utilizador descarregar pdf (Página 334)

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Rev. 1.00, 05/04, page 300 of 544

Bit Bit Name

Initial

Value R/W Description

0 ACKB 0 R/W Acknowledge Bit

Stores acknowledge data.

Transmit mode:

[Setting condition]

When 1 is received as the acknowledge bit when ACKE

= 1 in transmit mode

[Clearing conditions]

• When 0 is received as the acknowledge bit when

ACKE = 1 in transmit mode

• When 0 is written to the ACKE bit

Receive mode:

0: Returns 0 as acknowledge data after data reception

1: Returns 1 as acknowledge data after data reception

When this bit is read, the value loaded from the bus line

(returned by the receiving device) is read in

transmission (when TRS = 1). In reception (when TRS

= 0), the value set by internal software is read.

When this bit is written, acknowledge data that is

returned after receiving is rewritten regardless of the

TRS value. If bit in ICSR is written using bit-

manipulation instructions, the acknowledge data should

be re-set since the acknowledge data setting is

rewritten by the ACKB bit reading value.

Write the ACKE bit to 0 to clear the ACKB flag to 0,

before transmission is ended and a stop condition is

issued in master mode, or before transmission is ended

and SDA is released to issue a stop condition by a

master device.

Note: * Only 0 can be written to clear the flag.

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