Rabbit Semiconductor 101-0505 Datasheet

A.5 I/O Address Assignments

Table A-5 lists the external I/O addresses for the display and keypad I/O.

Table A-5. Display and Keypad Output Addresses

External

Address

E000–E007

E008

E00A

E00B

Name

LCD

EN

KPEN

LED

Function

LCD control

Output enable for LEDs

Read keypad and IN12

LED0–LED6 and LCD backlight

PE7 serves as a system-enable control and LCD/keypad strobe. When PE7 is high or in a high-impedance status, all OP6800 outputs are disabled (digital outputs and display outputs are disabled, and RS-485 is at listen status).

User’s Manual 55

56 MiniCom (OP6800)