18

83C51KB HIGH PERFORMANCE KEYBOARD MICROCONTROLLER

Figure 6. External Data Memory Write Cycle

6.6 Testing Characteristics

Figure 7. Float Waveforms

A4256-01

ALE

PSEN#

PORT 0

P2.0 - P2.7 or A8 - A15 from DPH

PORT 2

A8 - A15 from PCH

A0-A7 from RI or DPL

A0 - A7 from PCL

Data Out

WR#

Instr. In

Timing Reference

Points

For timing purposes, a port pin is no longer floating when a

100 mV change from load voltage occurs and begins to float

A4243-01