mc68hc908ap8a Freescale Semiconductor, Inc, mc68hc908ap8a Datasheet - Page 228
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mc68hc908ap8a
Manufacturer Part Number
mc68hc908ap8a
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908AP8A.pdf
(316 pages)
- Current page: 228 of 316
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Multi-Master IIC Interface (MMIIC)
14.3 I/O Pins
The MMIIC module uses two I/O pins, shared with standard port I/O pins. The full name of the MMIIC I/O
pins are listed in
The SDA and SDL pins are open-drain. When configured as general purpose output pins (PTB0 and
PTB1), pullup resistors must be connected to these pins.
14.4 Multi-Master IIC System Configuration
The multi-master IIC system uses a serial data line SDA and a serial clock line SCL for data transfer. All
devices connected to it must have open collector (drain) outputs and the logical-AND function is
performed on both lines by two pull-up resistors.
228
$004C
$004D
$0048
$0049
$004A
$004B
$004E
$004F
Addr.
MMIIC Generic Pin Names:
MMIIC CRC Data Register
MMIIC Frequency Divider
MMIIC Control Register 1
MMIIC Control Register 2
MMIIC Address Register
MMIIC Status Register
Register Name
MMIIC Data Transmit
MMIIC Data Receive
SDA
SCL
Table
(MMCRDR)
(MMADR)
(MMCR1)
(MMCR2)
(MMDTR)
(MDDRR)
(MMFDR)
(MMSR)
Register
Register
Register
14-1. The generic pin name appear in the text that follows.
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read: MMRXIF
Read:
Read:
Read: MMCRCD7 MMCRCD6 MMCRCD5 MMCRCD4 MMCRCD3 MMCRCD2 MMCRCD1 MMCRCD0
Read:
Write:
Write:
Write:
Write:
Write:
Write:
Write:
Write:
Figure 14-1. MMIIC I/O Register Summary
MC68HC908AP A-Family Data Sheet, Rev. 3
Table 14-1. Pin Name Conventions
MMALIF
MMRD7
MMAD7
MMTD7
MMEN
Full MCU Pin Names:
Bit 7
1
0
0
0
0
0
0
0
0
0
0
PTB0/SDA
PTB1/SCL
= Unimplemented
MMNAKIF
MMTXIF
MMRD6
MMAD6
MMTD6
MMIEN
6
0
0
0
0
0
0
0
0
0
0
0
MMCLRBB
MMATCH
MMRD5
MMAD5
MMTD5
MMBB
5
1
0
0
0
0
0
0
0
0
0
MMSRW
MMRD4
MMAD4
MMAST
MMTD4
4
0
0
0
0
0
0
0
0
0
0
Pin Selected for MMIIC Function By:
MMEN bit in MMCR1 ($0049)
MMTXAK
MMRXAK MMCRCBF MMTXBE
MMAD3
MMRD3
MMTD3
MMRW
3
0
0
0
1
0
0
0
0
0
REPSEN
MMAD2
MMRD2
MMBR2
MMTD2
2
0
0
0
0
0
0
0
0
1
Freescale Semiconductor
MMCRCBYTE
MMAD1
MMTD1
MMRD1
MMBR1
1
0
0
0
0
1
0
0
0
0
MMEXTAD
MMCRCEF
Unaffected
MMRXBF
MMTD0
MMRD0
MMBR0
Bit 0
0
0
0
0
0
0
0
0
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