Z84C9008VSG Zilog, Z84C9008VSG Datasheet - Page 29

• Manufacturer Part Number: Z84C9008VSG
• Description: IC 8MHZ Z80 KIO 84-PLCC
• Manufacturer: Zilog
• Series: Z80r

Specifications of Z84C9008VSG

• Processor Type: Z80
• Features: Serial/Parallel Input/Output, Counter/Timer Circuit
• Speed: 8MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 84-LCC (J-Lead)
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Cpu Speed: 8MHz
• Digital Ic Case Style: LCC
• No. Of Pins: 84
• Supply Voltage Range: 5V
• Operating Temperature Range: 0°C To +70°C
• Svhc: No SVHC (18-Jun-2010)
• Rohs Compliant: Yes
• Base Number: 84
• Clock Frequency: 8MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Z80 CPU
User’s Manual
9
IORQ
Input/Output Request (output, active Low, tristate). IORQ indicates that
the lower half of the address bus holds a valid I/O address for an I/O read or
write operation. IORQ is also generated concurrently with M1 during an
interrupt acknowledge cycle to indicate that an interrupt response vector can
be placed on the data bus.
M1
Machine Cycle One (output, active Low). M1, together with MREQ,
indicates that the current machine cycle is the opcode fetch cycle of an
instruction execution. M1 together with IORQ, indicates an interrupt
acknowledge cycle.
MREQ
Memory Request (output, active Low, tristate). MREQ indicates that the
address bus holds a valid address for a memory read of memory write
operation.
NMI
Non-Maskable Interrupt (input, negative edge-triggered). NMI has a
higher priority than INT. NMI is always recognized at the end of the current
instruction, independent of the status of the interrupt enable flip-flop, and
automatically forces the CPU to restart at location
.
0066H
RD
Read (output, active Low, tristate). RD indicates that the CPU wants to
read data from memory or an I/O device. The addressed I/O device or
memory should use this signal to gate data onto the CPU data bus.
RESET
Reset (input, active Low). RESET initializes the CPU as follows: it resets
the interrupt enable flip-flop, clears the PC and registers I and R, and sets the
UM008005-0205
Overview