Z84C9008VSG Zilog, Z84C9008VSG Datasheet - Page 37

• 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

UM008005-0205
Non-Maskable Interrupt Response
A
D
15
7
MREQ
IORQ
WAIT
— A
— D
CLK
RD
INT
M1
Figure 9.
Figure 10 illustrates the request/acknowledge cycle for the non-maskable
interrupt. This signal is sampled at the same time as the interrupt line, but
this line takes priority over the normal interrupt and it can not be disabled
under software control. Its usual function is to provide immediate response
to important signals such as an impending power failure. The CPU response
to a non-maskable interrupt is similar to a normal memory read operation.
The only difference is that the content of the data bus is ignored while the
processor automatically stores the PC in the external stack and jumps to
location
begin at this location if this interrupt is used.
0
0
Last M Cycle of Instruction
0066H
Interrupt Request/Acknowledge Cycle
Last T State
. The service routine for the non-maskable interrupt must
T
1
T
PC
2
M1
T
W*
User’s Manual
T
W*
Z80 CPU
In
Overview
Refresh
T
3
17