MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 13

• Manufacturer Part Number: MC68EC000EI20
• Description: IC MPU 32BIT 20MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC000EI20

• Processor Type: M680x0 32-Bit
• Speed: 20MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

Introduction
1.1 INTEGER UNIT USER PROGRAMMING MODEL
Figure 1-1 illustrates the integer portion of the user programming model. It consists of the
following registers:
1.1.1 Data Registers (D7 – D0)
These registers are for bit and bit field (1 – 32 bits), byte (8 bits), word (16 bits), long-word
(32 bits), and quad-word (64 bits) operations. They also can be used as index registers.
1.1.2 Address Registers (A7 – A0)
These registers can be used as software stack pointers, index registers, or base address
registers. The base address registers can be used for word and long-word operations.
Register A7 is used as a hardware stack pointer during stacking for subroutine calls and
exception handling. In the user programming model, A7 refers to the user stack pointer
(USP).
1-2
• 16 General-Purpose 32-Bit Registers (D7 – D0, A7 – A0)
• 32-Bit Program Counter (PC)
• 8-Bit Condition Code Register (CCR)
31
31
31
31
Figure 1-1. M68000 Family User Programming Model
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
15
15
15
15
.
7
0
0
0
0
0
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
A3
A4
A5
A6
A7
(USP)
PC
CCR
DATA
REGISTERS
ADDRESS
REGISTERS
USER
STACK
POINTER
PROGRAM
COUNTER
CONDITION
CODE
REGISTER
MOTOROLA