MCHC912B32CFUE8 Freescale Semiconductor, MCHC912B32CFUE8 Datasheet - Page 61

• Manufacturer Part Number: MCHC912B32CFUE8
• Description: IC MCU 32K FLASH 8MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC12r

Specifications of MCHC912B32CFUE8

• Core Processor: CPU12
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 63
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 768 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Cpu Family: HC12
• Device Core Size: 16b
• Frequency (max): 8MHz
• Interface Type: SCI/SPI
• 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 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 80
• Package Type: PQFP
• Package: 80PQFP
• Family Name: HC12
• Maximum Speed: 8 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 16 Bit
• Number Of Programmable I/os: 63
• Processor Series: HC912B
• Core: HC12
• Data Ram Size: 1 KB
• Maximum Clock Frequency: 8 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWHCS12
• Development Tools By Supplier: M68EVB912B32E
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.3.3 Index Registers X and Y
Index registers X and Y are used for indexed addressing. Indexed addressing adds the value in an index
register to a constant or to the value in an accumulator to form the effective address of the operand.
Index registers X and Y can also serve as temporary data storage locations.
3.3.4 Stack Pointer
The stack pointer (SP) contains the last stack address used. The CPU12 supports an automatic program
stack that is used to save system context during subroutine calls and interrupts.
The stack pointer can also serve as a temporary data storage location or as an index register for indexed
addressing.
Freescale Semiconductor
Reset:
Reset:
Reset:
Read:
Write:
Read:
Write:
Read:
Write:
Bit 15
Bit 15
Bit 15
SP15
X15
Y15
SP14
X14
Y14
14
14
14
The LDX and STX instructions can be used to manipulate data in and out
of index register X.
The LDY and STY instructions can be used to manipulate data in and out
of index register Y.
The LDS and STS instructions can be used to manipulate data in and out
of the stack pointer.
SP13
X13
Y13
13
13
13
SP12
X12
Y12
12
12
12
SP11
X11
Y11
11
11
11
Figure 3-5. Index Register X (X)
Figure 3-6. Index Register Y (Y)
M68HC12B Family Data Sheet, Rev. 9.1
Figure 3-7. Stack Pointer (SP)
SP10
X10
Y10
10
10
10
SP9
X9
Y9
9
9
9
Unaffected by reset
Unaffected by reset
Unaffected by reset
NOTE
NOTE
NOTE
SP8
X8
Y8
8
8
8
SP7
X7
Y7
7
7
7
SP6
X6
Y6
6
6
6
SP5
X5
Y5
5
5
5
SP4
X4
Y4
4
4
4
SP3
X3
Y3
3
3
3
SP2
X2
Y2
2
2
2
CPU Registers
SP1
X1
Y1
1
1
1
Bit 0
Bit 0
Bit 0
SP0
X0
Y0
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