P912XDP512F0MPVR datasheet(413/1348 Pages) FREESCALE

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Chapter 9 Inter-Integrated Circuit (IICV2) Block Description

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

413

9.5

Resets

The reset state of each individual bit is listed in Section 9.3, “Memory Map and Register Deﬁnition,” which

details the registers and their bit-ﬁelds.

9.6

Interrupts

IICV2 uses only one interrupt vector.

Table 9-8. Interrupt Summary

Internally there are three types of interrupts in IIC. The interrupt service routine can determine the interrupt

type by reading the status register.

IIC Interrupt can be generated on

1. Arbitration lost condition (IBAL bit set)

2. Byte transfer condition (TCF bit set)

3. Address detect condition (IAAS bit set)

The IIC interrupt is enabled by the IBIE bit in the IIC control register. It must be cleared by writing 0 to

the IBF bit in the interrupt service routine.

9.7

Initialization/Application Information

9.7.1

IIC Programming Examples

9.7.1.1

Initialization Sequence

Reset will put the IIC bus control register to its default status. Before the interface can be used to transfer

serial data, an initialization procedure must be carried out, as follows:

1. Update the frequency divider register (IBFD) and select the required division ratio to obtain SCL

frequency from system clock.

2. Update the IIC bus address register (IBAD) to deﬁne its slave address.

3. Set the IBEN bit of the IIC bus control register (IBCR) to enable the IIC interface system.

4. Modify the bits of the IIC bus control register (IBCR) to select master/slave mode, transmit/receive

mode and interrupt enable or not.

Interrupt

Offset

Vector

Priority

Source

Description

IIC

Interrupt

—

IBAL, TCF, IAAS

bits in IBSR

When either of IBAL, TCF or IAAS bits is set

may cause an interrupt based on arbitration

lost, transfer complete or address detect

conditions

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