MC705P6ACDWE Freescale Semiconductor, MC705P6ACDWE Datasheet - Page 71
Manufacturer Part Number
IC MCU 176 BYTES RAM 28-SOIC
Specifications of MC705P6ACDWE
Number Of I /o
Program Memory Size
4.5KB (4.5K x 8)
Program Memory Type
176 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
-40°C ~ 85°C
Package / Case
28-SOIC (7.5mm Width)
Data Bus Width
Data Ram Size
Maximum Clock Frequency
Number Of Programmable I/os
Number Of Timers
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
8 bit, 4 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / Rohs Status
The MCU instruction set has 62 instructions and uses eight addressing modes. The instructions include
all those of the M146805 CMOS Family plus one more: the unsigned multiply (MUL) instruction. The MUL
instruction allows unsigned multiplication of the contents of the accumulator (A) and the index register (X).
The high-order product is stored in the index register, and the low-order product is stored in the
13.2 Addressing Modes
The CPU uses eight addressing modes for flexibility in accessing data. The addressing modes provide
eight different ways for the CPU to find the data required to execute an instruction. The eight addressing
Inherent instructions are those that have no operand, such as return from interrupt (RTI) and stop (STOP).
Some of the inherent instructions act on data in the CPU registers, such as set carry flag (SEC) and
increment accumulator (INCA). Inherent instructions require no operand address and are one byte long.
Immediate instructions are those that contain a value to be used in an operation with the value in the
accumulator or index register. Immediate instructions require no operand address and are two bytes long.
The opcode is the first byte, and the immediate data value is the second byte.
Direct instructions can access any of the first 256 memory locations with two bytes. The first byte is the
opcode, and the second is the low byte of the operand address. In direct addressing, the CPU
automatically uses $00 as the high byte of the operand address.
Indexed, no offset
Indexed, 8-bit offset
Indexed, 16-bit offset
MC68HC705P6A Advance Information Data Sheet, Rev. 2.1