mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 299

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

17.6.9 Packet Error Code
17.7 MMIIC I/O Registers
17.7.1
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
MMIIC
Address Register (MMADR)
Address:
The packet error code (PEC) for the MMIIC interface is in the form a
cyclic redundancy code (CRC). The PEC is generated by hardware for
every transmitted and received byte of data. The transmission of the
generated PEC is controlled by user software.
The CRC data register, MMCRCDR, contains the generated PEC byte,
with three other bits in the MMIIC control registers and status register
monitoring and controlling the PEC byte.
These I/O registers control and monitor MMIIC operation:
Reset:
Read:
Write:
•
•
•
•
•
•
•
•
MMIIC address register (MMADR) — $0048
MMIIC control register 1 (MMCR1) — $0049
MMIIC control register 2 (MMCR2) — $004A
MMIIC status register (MMSR) — $004B
MMIIC data transmit register (MMDTR) — $004C
MMIIC data receive register (MMDRR) — $004D
MMIIC CRC data register (MMCRCDR) — $004E
MMIIC frequency divide register (MMFDR) — $004F
MMAD7
$0048
Bit 7
Figure 17-4. MMIIC Address Register (MMADR)
Multi-Master IIC Interface (MMIIC)
1
MMAD6
6
0
MMAD5
5
1
MMAD4
4
0
MMAD3
3
0
Multi-Master IIC Interface (MMIIC)
MMAD2
2
0
MMIIC I/O Registers
MMAD1
1
0
Data Sheet
MMEXTAD
Bit 0
0
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