MC68HC705C8ACFN Freescale Semiconductor, MC68HC705C8ACFN Datasheet - Page 48

• Manufacturer Part Number: MC68HC705C8ACFN
• Description: IC MCU 4MHZ 8K OTP 44-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705C8ACFN

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 24
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: OTP
• Ram Size: 304 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Central Processor Unit (CPU)
3.4 Arithmetic/Logic Unit (ALU)
Technical Data
48
N — Negative Flag
Z — Zero Flag
C — Carry/Borrow Flag
The arithmetic/logic unit (ALU) performs the arithmetic and logical
operations defined by the instruction set. The binary arithmetic circuits
decode instructions and set up the ALU for the selected operation. Most
binary arithmetic is based on the addition algorithm, carrying out
subtraction as negative addition. Multiplication is not performed as a
discrete operation but as a chain of addition and shift operations within
the ALU. The multiply instruction requires 11 internal clock cycles to
complete this chain of operations.
The CPU sets the negative flag when an arithmetic operation, logical
operation, or data manipulation produces a negative result (bit 7 in the
results is a logic 1). Reset has no effect on the negative flag.
The CPU sets the zero flag when an arithmetic operation, logical
operation, or data manipulation produces a result of $00. Reset has
no effect on the zero flag.
The CPU sets the carry/borrow flag when an addition operation
produces a carry out of bit 7 of the accumulator or when a subtraction
operation requires a borrow. Some logical operations and data
manipulation instructions also clear or set the carry/borrow bit. Reset
has no effect on the carry/borrow flag.
Freescale Semiconductor, Inc.
For More Information On This Product,
Central Processor Unit (CPU)
Go to: www.freescale.com
MC68HC705C8A — Rev. 3
MOTOROLA