Electrical and Environmental Characteristics

Operating voltage

4.75 - 5.25 V

Current

140mA @ 29.49 MHz
98mA @ 18.432 MHz

Operating temp

-40.0°C to +85.0°C

Humidity

5-95%, non-condensing

Storage temp

-55.0°C to +125.0°C

Board size

48.3 x 58.4 x 12.7 mm

Pin Descriptions

Pin name(Pin number)

Type

Function

PCLK (J1-19)

out

Processor clock

-RES_OUT (J2-37)

out

Reset generator output (processor pin - RESET)

-RES_IN (J2-38)

in

Reset generator input

A0-A12 (J2-13:1)

out

Address bus

D0-D7 (J1-28:21)

I/O

Data bus

-WDTOUT (J1-40)

out

Watchdog timer output. Pulses low for 30µs when the timer expires.

STATUS (J2-14)

out

May be programmed as a general-purpose output or to indicate (when low) either an opcode fetch cycle or an interrupt acknowledge cycle.

SMODE0 (J2-35) SMODE1 (J2-36)

in

Boot mode. (See processor pin description). After booting these pins may be used as general-purpose inputs.

-IORD (J1-38) -IOWR (J1-37)

out

I/O read and write strobes. Active only during an I/O cycle.

PA0-PA7 (J1-3:10)

I/O

I/O port A. General-purpose I/O or slave port data. Configured as inputs on reset.

PB0-PB7 (J1-11-18)

I/O

I/O port B. General-purpose I/O, slave port control, serial port clocks.

PC0-PC7 (J2-15:22)

I/O

I/O port C. General-purpose I/O or serial data.

PD0-PD7 (J2-23:30)

I/O

I/O port D. General-purpose I/O (Open drain or active pull-up). Details.

PE0-PE7 (J1-36:29)

I/O

I/O port E. General-purpose I/O, I/O strobes, or external interrupts.

VBAT (J2-33)

in

Connection for an external battery to power clock.

VRAM (J2-34)

out

Power for battery-backed SRAM.

VCC (J1-2, J2-32, J2-39)

pwr

5 V

GND (J1-1, J1-20, J2-31, J2-40)

pwr

Ground