MC68HC908QY1CDW Freescale Semiconductor, MC68HC908QY1CDW Datasheet - Page 62
MC68HC908QY1CDW
Manufacturer Part Number
MC68HC908QY1CDW
Description
IC MCU 1.5K FLASH 16-SOIC
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908QY4MDWER.pdf
(184 pages)
Specifications of MC68HC908QY1CDW
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LVD, POR, PWM
Number Of I /o
13
Program Memory Size
1.5KB (1.5K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
16-SOIC (0.300", 7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Connectivity
-
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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.
62
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
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