MC68HC11E1CFN2 Freescale Semiconductor, MC68HC11E1CFN2 Datasheet - Page 74

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MC68HC11E1CFN2

Manufacturer Part Number
MC68HC11E1CFN2
Description
IC MCU 512 EEPROM 2MHZ 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Datasheet

Specifications of MC68HC11E1CFN2

Core Processor
HC11
Core Size
8-Bit
Speed
2MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
38
Program Memory Type
ROMless
Eeprom Size
512 x 8
Ram Size
512 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
52-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Program Memory Size
-

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Central Processor Unit (CPU)
4.2.1 Accumulators A, B, and D
Data Sheet
74
15
7
Accumulators A and B are general-purpose 8-bit registers that hold operands and
results of arithmetic calculations or data manipulations. For some instructions,
these two accumulators are treated as a single double-byte (16-bit) accumulator
called accumulator D. Although most instructions can use accumulators A or B
interchangeably, these exceptions apply:
A
The ABX and ABY instructions add the contents of 8-bit accumulator B to
the contents of 16-bit register X or Y, but there are no equivalent instructions
that use A instead of B.
The TAP and TPA instructions transfer data from accumulator A to the
condition code register or from the condition code register to accumulator A.
However, there are no equivalent instructions that use B rather than A.
The decimal adjust accumulator A (DAA) instruction is used after
binary-coded decimal (BCD) arithmetic operations, but there is no
equivalent BCD instruction to adjust accumulator B.
The add, subtract, and compare instructions associated with both A and B
(ABA, SBA, and CBA) only operate in one direction, making it important to
plan ahead to ensure that the correct operand is in the correct accumulator.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 4-1. Programming Model
0
SP
PC
D
IX
IY
7
Go to: www.freescale.com
7
Central Processor Unit (CPU)
S
X
H
I
B
N
Z
V
C
0
0
0
8-BIT ACCUMULATORS A & B
OR 16-BIT DOUBLE ACCUMULATOR D
INDEX REGISTER X
INDEX REGISTER Y
STACK POINTER
PROGRAM COUNTER
CONDITION CODES
CARRY/BORROW FROM MSB
OVERFLOW
ZERO
NEGATIVE
I-INTERRUPT MASK
HALF CARRY (FROM BIT 3)
X-INTERRUPT MASK
STOP DISABLE
M68HC11E Family — Rev. 5
MOTOROLA

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