MC908AP32CFBE Freescale, MC908AP32CFBE Datasheet - Page 243

• Manufacturer Part Number: MC908AP32CFBE
• Manufacturer: Freescale

Specifications of MC908AP32CFBE

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI/SPI
• Total Internal Ram Size: 2KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: PQFP
• Program Memory Type: Flash
• Program Memory Size: 32KB
• Lead Free Status / RoHS Status: Compliant

14.7 Program Algorithm
When the MMIIC module detects an arbitration loss in master mode, it releases both SDA and SCL lines
immediately. But if there are no further STOP conditions detected, the module will hang up. Therefore, it
is recommended to have time-out software to recover from this condition. The software can start the
time-out counter by looking at the MMBB (bus busy) flag and reset the counter on the completion of one
byte transmission. If a time-out has occurred, software can clear the MMEN bit (disable MMIIC module)
to release the bus, and hence clear the MMBB flag. This is the only way to clear the MMBB flag by
software if the module hangs up due to a no STOP condition received. The MMIIC can resume operation
again by setting the MMEN bit.
Freescale Semiconductor
MMBR2
0
0
0
0
1
1
1
1
MMBR1
The frequency of the MMIIC baud rate is only guaranteed for 100kHz to
10kHz. The divider is available for the flexibility on bus frequency selection.
0
0
1
1
0
0
1
1
MMBR0
0
1
0
1
0
1
0
1
Table 14-2. MMIIC Baud Rate Selection
MC68HC908AP Family Data Sheet, Rev. 4
Divider
1280
2560
160
320
640
20
40
80
3.125kHz
12.5kHz
6.25kHz
400kHz
200kHz
100kHz
NOTE
50kHz
25kHz
8MHz
MMIIC Baud Rates for Bus Clocks:
1.5625kHz
3.125kHz
12.5kHz
6.25kHz
200kHz
100kHz
50kHz
25kHz
4MHz
0.78125kHz
1.5625kHz
3.125kHz
12.5kHz
6.25kHz
100kHz
50kHz
25kHz
2MHz
Program Algorithm
0.78125kHz
1.5625kHz
0.3906kHz
3.125kHz
12.5kHz
6.25kHz
50kHz
25kHz
1MHz
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