KSI-W015-000

5

RST: PIN 9 (DIP40), PIN 10 (PLCC44)

Reset input. A high on this pin for two machine cycles while the oscillator is running

resets the device. An internal pulldown resistor permits a power-on reset with

only a capacitor connected to V

ALE: PIN 30 (DIP40), PIN 33 (PLCC44)

Address latch enable output pulse for latching the low byte of the address

during accesses to external memory.

In normal operation ALE is emitted at a constant rate of 1/6 the oscillator frequency,

and may be used for external timing or clocking purposes.

Note : However, that one ALE pulse is skipped during each access to external

data memory.

This pin is also the program pulse input PROG during EPROM programming.

PSEN : PIN 29 (DIP 40), PIN 32 (PLCC44)

Program store enable is the read strobe to external program memory. When the 60C52

is executing code from external program memory, PSEN is activated twice each machine

cycle, except that two PSEN activations are skipped during each access to external

data memory. PSEN is not activated during fetches from internal program memory.

EA: PIN 31 (DIP 40), PIN 35 (PLCC44)

External access enable. EA must be strapped to V

to fetch code from external program memory locations starting at 0000H up to FFFFH.

If EA is strapped to V

the program counter contains an address greater than 0FFFH.

XTAL1: PIN 19 (DIP 40), PIN 21 (PLCC44)

Input to the Inverting oscillator amplifier and input to the internal clock generator circuits.

XTAL2: PIN 18 (DIP 40), PIN 20 (PLCC44)

Output from the inverting oscillator amplifier

0 Crystal Oscillator

NC: PIN1, 12, 23, 34 (PLCC44)

Non connection pins.

30pF

30pF

XTAL1

XTAL2

SD60C32/P SD60C52/P