IC89C54 Datasheet, PDF (23/24 Pages) Integrated Circuit Solution Inc – CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 16/32/64-Kbytes of FLASH

IC89C54/58/64
P2.6
P0[7-0]
1st stage
test mode
tSLSH ^enable
tCVSL
tPHCH
89H
59H
89H
1. EA#, PROG#, P3.7, P2.7 are high level; P3.6 is low level.
2rd stage
test mode
enable
59H
Figure 18. Test Mode Entering Timing
Vcc — 0.5V
0.45V
0.7Vcc
0.2Vcc — 0.1
tCHCL
tCLCX
tCHCX
tCLCH
tCLCL
Figure 19. External Clock Drive Waveform
Vcc - 0.5V
0.45V
0.2Vcc + 0.9V
0.2Vcc - 0.1V
Figure 20. AC Test Point
Note:
1.AC inputs during testing are driven at Vcc-0.5v for logic “1” and 0.45V for logic “0”.
Timing measurements are made at Vih min for logic “1” and max for logic “0”.
Integrated Circuit Solution Inc.
23
MC009-0B