HD6432138SW datasheet(534/1061 Pages) RENESAS

534 / 1061 page

Section 16 I

2C Bus Interface [H8S/2138 Group Option]

Rev. 4.00 Jun 06, 2006 page 480 of 1004

REJ09B0301-0400

Bit 0—Acknowledge Bit (ACKB): Stores acknowledge data. In transmit mode, after the

receiving device receives data, it returns acknowledge data, and this data is loaded into ACKB. In

receive mode, after data has been received, the acknowledge data set in this bit is sent to the

transmitting device.

When this bit is read, in transmission (when TRS = 1), the value loaded from the bus line

(returned by the receiving device) is read. In reception (when TRS = 0), the value set by internal

software is read.

When this bit is written to, the acknowledge data transmitted at the receipt is rewritten regardless

of the TRS value. The data loaded from the receiving device is retained, therefore take care of

using bit-manipulation instructions.

Bit 0

ACKB

Description

Receive mode: 0 is output at acknowledge output timing

(Initial value)

Transmit mode: Indicates that the receiving device has acknowledged the data (signal

is 0)

Receive mode: 1 is output at acknowledge output timing

Transmit mode: Indicates that the receiving device has not acknowledged the data

(signal is 1)

16.2.7

Serial Timer Control Register (STCR)

Bit

Initial value

Read/Write

—

R/W

IICX1

R/W

IICX0

R/W

IICE

R/W

FLSHE

R/W

ICKS0

R/W

—

R/W

ICKS1

R/W

STCR is an 8-bit readable/writable register that controls register access, the I

2C interface operating

mode (when the on-chip IIC option is included), and on-chip flash memory (F-ZTAT versions),

and selects the TCNT input clock source. For details of functions not related to the I

2C bus

interface, see section 3.2.4, Serial Timer Control Register (STCR), and the descriptions of the

relevant modules. If a module controlled by STCR is not used, do not write 1 to the corresponding

bit.

STCR is initialized to H'00 by a reset and in hardware standby mode.

Bit 7—Reserved: Do not write 1 to this bit.

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