MC68HC908MR8CP Freescale Semiconductor, MC68HC908MR8CP Datasheet - Page 73

• Manufacturer Part Number: MC68HC908MR8CP
• Description: IC MCU 8K FLASH 8MHZ PWM 28-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908MR8CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 12
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

6.4.1 Accumulator
6.4.2 Index Register
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
Read:
Write:
The accumulator is a general-purpose 8-bit register. The CPU uses the
accumulator to hold operands and the results of arithmetic/logic
operations.
The 16-bit index register allows indexed addressing of a 64-Kbyte
memory space. H is the upper byte of the index register, and X is the
lower byte. H:X is the concatenated 16-bit index register.
In the indexed addressing modes, the CPU uses the contents of the
index register to determine the conditional address of the operand.
The index register can serve also as a temporary data storage location.
Re-
set:
Read:
Write:
set:
Re-
X = Indeterminate
Bit
15
0
Bit 7
14
0
Central Processor Unit (CPU)
13
0
12
Figure 6-3. Index Register (H:X)
6
0
Figure 6-2. Accumulator (A)
11
0
5
10
0
Unaffected by reset
9
0
4
8
0
X
7
3
X
6
Central Processor Unit (CPU)
X
5
2
X
4
X
3
1
Technical Data
CPU Registers
2
X
X
1
Bit 0
Bit
X
0
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