Z84C2008PEG Zilog, Z84C2008PEG Datasheet - Page 25

• 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

Z80 CPU
User’s Manual
5
Accumulator and Flag Registers
The CPU includes two independent 8-bit accumulators and associated 8-bit
flag registers. The accumulator holds the results of 8-bit arithmetic or logical
operations while the
register indicates specific conditions for 8-bit or
FLAG
1 16-bit operations, such as indicating whether or not the result of an
operation is equal to zero. The programmer selects the accumulator and flag
pair with a single exchange instruction so that it is possible to work with
either pair.
General Purpose Registers
Two matched sets of general-purpose registers, each set containing six 8-bit
registers, may be used individually as 8-bit registers or as 16-bit register
pairs. One set is called BC, DE, and HL while the complementary set is
called BC', DE', and HL'. At any one time, the programmer can select either
set of registers to work through a single exchange command for the entire
set. In systems that require fast interrupt response, one set of general-
purpose registers and an
register may be reserved for
ACCUMULATOR/FLAG
handling this fast routine. One exchange command is executed to switch
routines. This greatly reduces interrupt service time by eliminating the
requirement for saving and retrieving register contents in the external stack
during interrupt or subroutine processing. These general-purpose registers
are used for a wide range of applications. They also simplify programing,
specifically in ROM-based systems where little external read/write memory
is available.
Arithmetic Logic Unit (ALU)
The 8-bit arithmetic and logical instructions of the CPU are executed in the
ALU. Internally, the ALU communicates with the registers and the external
data bus by using the internal data bus. Functions performed by the ALU
include:
UM008005-0205
Overview