MC68HC908QT1VDW Freescale Semiconductor, MC68HC908QT1VDW Datasheet - Page 62

• Manufacturer Part Number: MC68HC908QT1VDW
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908QT1VDW

• Product Category: 8-bit Microcontrollers - MCU
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 1.5 KB
• Data Ram Size: 128 B
• On-chip Adc: No
• Operating Supply Voltage: 3.3 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: SOIC-8
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Program Memory Type: Flash
• Factory Pack Quantity: 96
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V

Central Processor Unit (CPU)
7.3.1 Accumulator
The accumulator is a general-purpose 8-bit register. The CPU uses the accumulator to hold operands and
the results of arithmetic/logic operations.
7.3.2 Index Register
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.
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Reset:
Reset:
Read:
Write:
Read:
Write:
X = Indeterminate
15
15
15
Bit
15
0
Bit 7
14
0
H
13
0
6
MC68HC908QY/QT Family Data Sheet, Rev. 6
12
0
Figure 7-3. Index Register (H:X)
Figure 7-2. Accumulator (A)
Figure 7-1. CPU Registers
11
7
7
V 1 1 H I N Z C
0
5
10
0
X
9
0
Unaffected by reset
4
8
0
0
0
0
0
0
X
7
ACCUMULATOR (A)
INDEX REGISTER (H:X)
STACK POINTER (SP)
PROGRAM COUNTER (PC)
CONDITION CODE REGISTER (CCR)
CARRY/BORROW FLAG
ZERO FLAG
NEGATIVE FLAG
INTERRUPT MASK
HALF-CARRY FLAG
TWO’S COMPLEMENT OVERFLOW FLAG
3
X
6
X
5
2
4
X
X
3
1
2
X
Freescale Semiconductor
X
1
Bit 0
Bit
0
X