mc9s08dz32amlfr Freescale Semiconductor, Inc, mc9s08dz32amlfr Datasheet - Page 242
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mc9s08dz32amlfr
Manufacturer Part Number
mc9s08dz32amlfr
Description
Hcs08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08DZ32AMLFR.pdf
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Chapter 11 Inter-Integrated Circuit (S08IICV2)
11.3.5
In slave mode, the same functions are available after an address match has occurred.
The TX bit in IICxC must correctly reflect the desired direction of transfer in master and slave modes for
the transmission to begin. For instance, if the IIC is configured for master transmit but a master receive is
desired, reading the IICxD does not initiate the receive.
Reading the IICxD returns the last byte received while the IIC is configured in master receive or slave
receive modes. The IICxD does not reflect every byte transmitted on the IIC bus, nor can software verify
that a byte has been written to the IICxD correctly by reading it back.
In master transmit mode, the first byte of data written to IICxD following assertion of MST is used for the
address transfer and should comprise of the calling address (in bit 7 to bit 1) concatenated with the required
R/W bit (in position bit 0).
11.3.6
242
Reset
Reset
Field
DATA
7–0
W
W
R
R
GCAEN
IIC Data I/O Register (IICxD)
IIC Control Register 2 (IICxC2)
Data — In master transmit mode, when data is written to the IICxD, a data transfer is initiated. The most
significant bit is sent first. In master receive mode, reading this register initiates receiving of the next byte of data.
0
0
7
7
When transitioning out of master receive mode, the IIC mode should be
switched before reading the IICxD register to prevent an inadvertent
initiation of a master receive data transfer.
= Unimplemented or Reserved
ADEXT
0
0
6
6
Figure 11-8. IIC Control Register (IICxC2)
Figure 11-7. IIC Data I/O Register (IICxD)
MC9S08DZ128 Series Data Sheet, Rev. 1
Table 11-8. IICxD Field Descriptions
0
0
0
5
5
NOTE
0
0
0
4
4
Description
DATA
3
0
3
0
0
AD10
0
0
2
2
Freescale Semiconductor
AD9
0
0
1
1
AD8
0
0
0
0
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