MC68HC912B32VFU8 Freescale Semiconductor, MC68HC912B32VFU8 Datasheet - Page 123

• Manufacturer Part Number: MC68HC912B32VFU8
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC912B32VFU8

• Cpu Family: HC12
• Device Core Size: 16b
• Frequency (max): 8MHz
• Interface Type: SCI/SPI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 1KB
• # I/os (max): 63
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 105C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 80
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

Freescale Semiconductor
P CLOCK
÷
÷
÷
÷
÷
÷
÷
÷
2
2
2
2
2
2
2
2
BITS: SPR2, SPR1, AND SPR0
REGISTER: SP0BR
0:0:1
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
0:0:0
Figure 10-13. Clock Chain for SPI, ATD, and BDM
COUNTER (PR0-PR4)
5-BIT MODULUS
M68HC12B Family Data Sheet, Rev. 9.1
BIT RATE
SPI
SYNCHRONIZER
E CLOCK
LOGIC
BKGD
PIN
÷
2
BKGD DIRECTION
BKGD OUT
BKGD IN
TO ATD
BDM BIT CLOCK:
Receive: Detect falling edge,
count 12 E clocks, sample input
Transmit 1: Detect falling edge,
count 6 E clocks while output is
high impedance, drive out 1 E
cycle pulse high,
high-impedance output again
Transmit 0: Detect falling edge,
drive out low, count 9 E clocks,
drive out 1 E cycle pulse high,
high-impedance output
Clock Divider Chains
123