Epson PX-8 Technical Manual page 276

REV.-A
Pin No. Signal Name
In/Out Function
- -
16
INTR Input: An interrupt request signal. When this
(Interrupt Request) active low
signal becomes active, CPU enters the inter-
rupt processing program after the current
instruction has been executed.
- -
17 NMI Input-negative: A non-maskable interrupt request signal.
(Non Maskable edge triggered When this signal becomes active, CPU
Interrupt)
jumps to address 0066(16) after the current
instruction has been executed, regardless of
whether interrupt is enabled or not.
-
The NMI signal has a priority over the INT
signal.
-
26 RS
Input: Resets CPU when active.
(Reset)
active low
- -
25 BURO Input: When active, this signal causes CPU to force
(Bus Request)
active low the address bus (AO-15), data bus (00-7), and tri-
state system control terminals (MREO, IORO,
- - -
RD, and WD) in the high impedance state,
freeing the external buses for another
device.
- -
The BUSRO signal has priority over the NMI
signal.
- -
23 BUAK Output: When active, this signal indicates that CPU
(Bus
active low has forced the address bus, data bus, and tri-
Acknowledge) state system control terminals in the high
impedance state.
6 ClK Input
A 0/+5V single-phase clock signal
(Clock)
7-5