mc9s08ac16 Freescale Semiconductor, Inc, mc9s08ac16 Datasheet - Page 239

• Manufacturer Part Number: mc9s08ac16
• Description: Hcs08 Microcontrollers 8-bit Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

13.4
This section provides a complete functional description of the IIC module.
13.4.1
The IIC bus system uses a serial data line (SDA) and a serial clock line (SCL) for data transfer. All devices
connected to it must have open drain or open collector outputs. A logic AND function is exercised on both
lines with external pull-up resistors. The value of these resistors is system dependent.
Normally, a standard communication is composed of four parts:
The stop signal should not be confused with the CPU stop instruction. The IIC bus system communication
is described briefly in the following sections and illustrated in
Freescale Semiconductor
AD[10:8]
GCAEN
ADEXT
Field
•
•
•
•
2–0
7
6
Start signal
Slave address transmission
Data transfer
Stop signal
Functional Description
IIC Protocol
General Call Address Enable. The GCAEN bit enables or disables general call address.
0 General call address is disabled
1 General call address is enabled
Address Extension. The ADEXT bit controls the number of bits used for the slave address.
0 7-bit address scheme
1 10-bit address scheme
Slave Address. The AD[10:8] field contains the upper three bits of the slave address in the 10-bit address
scheme. This field is only valid when the ADEXT bit is set.
Table 13-8. IIC1C2 Field Descriptions
MC9S08AC16 Series Data Sheet, Rev. 0
PRELIMINARY
Description
Figure
Chapter 13 Inter-Integrated Circuit (S08IICV2)
13-9.
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