Z84C2008PEG Zilog, Z84C2008PEG Datasheet - Page 23

• Manufacturer Part Number: Z84C2008PEG
• Description: IC 8MHZ Z80 CMOS PIO 40-DIP
• Manufacturer: Zilog
• Series: Z80r

Specifications of Z84C2008PEG

• Processor Type: Z80
• Features: Low Power CMOS
• Speed: 8MHz
• Voltage: 5V
• Mounting Type: Through Hole
• Package / Case: 40-DIP (0.620", 15.75mm)
• Cpu Speed: 8MHz
• Digital Ic Case Style: DIP
• No. Of Pins: 40
• Supply Voltage Range: 5V
• Operating Temperature Range: -40°C To +100°C
• Svhc: No SVHC (18-Jun-2010)
• Rohs Compliant: Yes
• Processor Series: Z84C2xx
• Core: Z80
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 16
• Operating Supply Voltage: 0 V to 5 V
• Maximum Operating Temperature: + 100 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 40 C
• Base Number: 84
• Clock Frequency: 8MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

UM008005-0205
Figure 2.
Special-Purpose Registers
Program Counter (PC)
The program counter holds the 16-bit address of the current instruction
being fetched from memory. The PC is automatically incremented after its
contents have been transferred to the address lines. When a program jump
occurs, the new value is automatically placed in the PC, overriding the
incrementer.
Stack Pointer (SP)
The stack pointer holds the 16-bit address of the current top of a stack
located anywhere in external system RAM memory. The external stack
memory is organized as a last-in first-out (LIFO) file. Data can be pushed
onto the stack from specific CPU registers or popped off of the stack to
specific CPU registers through the execution of PUSH and POP
instructions. The data popped from the stack is always the last data pushed
onto it. The stack allows simple implementation of multiple level interrupts,
Stack Pointer
Accumulator
Index Register
Program Counter
Index Register
Interrupt Vector
Main Register Set
B
D
A
H
I
Z80 CPU Register Configuration
Flags
C
E
F
L
Memory Refresh
R
IX
IY
SP
PC
Accumulator
Alternate Register Set
B '
D '
H '
A '
Special
Purpose
Registers
Flags
B '
E '
F '
L '
General
Purpose
Registers
User’s Manual
Z80 CPU
Overview
3