MC68HC711E20CFN2 Freescale Semiconductor, MC68HC711E20CFN2 Datasheet - Page 47

• Manufacturer Part Number: MC68HC711E20CFN2
• Description: IC MCU 20K 2MHZ OTP 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711E20CFN2

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 2MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 38
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: OTP
• Eeprom Size: 512 x 8
• Ram Size: 768 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

3.3.1 Accumulators A, B, and D
M68HC11E Family — Rev. 3.2
MOTOROLA
15
7
A
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:
•
•
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.
Figure 3-1. Programming Model
0
SP
PC
D
IX
IY
Central Processor Unit (CPU)
7
7
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
Central Processor Unit (CPU)
CPU Registers
Technical Data
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