MC812A4CPVE8 Freescale Semiconductor, MC812A4CPVE8 Datasheet - Page 44

• Manufacturer Part Number: MC812A4CPVE8
• Description: IC MCU 16BIT EEPROM 4K 112-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC12r

Specifications of MC812A4CPVE8

• Core Processor: CPU12
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 83
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: EEPROM
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 112-LQFP
• Processor Series: HC812A
• Core: HC12
• Data Bus Width: 16 bit
• Data Ram Size: 1 KB
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 91
• Number Of Timers: 8
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 8 Channel
• Controller Family/series: 68HC12
• No. Of I/o's: 91
• Eeprom Memory Size: 4KB
• Ram Memory Size: 1KB
• Cpu Speed: 8MHz
• No. Of Timers: 1
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Central Processor Unit (CPU12)
3.3 CPU Registers
This section describes the CPU registers.
3.3.1 Accumulators A and B
Accumulators A and B are general-purpose 8-bit accumulators that contain operands and results of
arithmetic calculations or data manipulations.
3.3.2 Accumulator D
Accumulator D is the concatenation of accumulators A and B. Some instructions treat the combination of
these two 8-bit accumulators as a 16-bit double accumulator.
44
Reset:
Bit 15
(A7)
D15
(A6)
D14
14
Reset:
Reset:
(A5)
D13
13
Bit 7
Bit 7
A7
B7
D12
(A4)
12
D11
(A3)
11
A6
B6
6
6
Figure 3-4. Accumulator D (D)
Figure 3-2. Accumulator A (A)
Figure 3-3. Accumulator B (B)
MC68HC812A4 Data Sheet, Rev. 7
D10
(A2)
10
A5
B5
5
5
D9 (A1) D8 (A0) D7 (B7) D6 (B6) D5 (B5) D4 (B4) D3 (B3) D2 (B2) D1 (B1) D0 (B0)
9
Unaffected by reset
Unaffected by reset
Unaffected by reset
A4
B4
4
4
8
7
A3
B3
3
3
6
A2
B2
2
2
5
4
A1
B1
1
1
3
Freescale Semiconductor
Bit 0
Bit 0
A0
B0
2
1
Bit 0