HCS08 datasheet(168/316 Pages) NXP

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Inter-Integrated Circuit (S08IICV2)

MC9S08SG8 MCU Series Data Sheet, Rev. 8

168

Freescale Semiconductor

11.3.3

IIC Control Register (IICC1)

11.3.4

IIC Status Register (IICS)

321

IICEN

IICIE

MST

TXAK

000

RSTA

Reset

000

= Unimplemented or Reserved

Figure 11-5. IIC Control Register (IICC1)

Table 11-6. IICC1 Field Descriptions

Field

Description

IICEN

IIC Enable. The IICEN bit determines whether the IIC module is enabled.

0 IIC is not enabled

1 IIC is enabled

IICIE

IIC Interrupt Enable. The IICIE bit determines whether an IIC interrupt is requested.

0 IIC interrupt request not enabled

1 IIC interrupt request enabled

MST

Master Mode Select. The MST bit changes from a 0 to a 1 when a start signal is generated on the bus and

master mode is selected. When this bit changes from a 1 to a 0 a stop signal is generated and the mode of

operation changes from master to slave.

0Slave mode

1 Master mode

Transmit Mode Select. The TX bit selects the direction of master and slave transfers. In master mode, this bit

should be set according to the type of transfer required. Therefore, for address cycles, this bit is always high.

When addressed as a slave, this bit should be set by software according to the SRW bit in the status register.

0 Receive

1 Transmit

TXAK

Transmit Acknowledge Enable. This bit specifies the value driven onto the SDA during data acknowledge

cycles for master and slave receivers.

0 An acknowledge signal is sent out to the bus after receiving one data byte

1 No acknowledge signal response is sent

RSTA

Repeat start. Writing a 1 to this bit generates a repeated start condition provided it is the current master. This

bit is always read as cleared. Attempting a repeat at the wrong time results in loss of arbitration.

321

RTCF

IAAS

BUSY

ARBL

0SRW

IICIF

RXAK

Reset

100

000

= Unimplemented or Reserved

Figure 11-6. IIC Status Register (IICS)

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