Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller PLCC 52 (19.2x19.2) 8-Bit 60 MHz I/O number 36

33

AT89C51AC3

4383D–8051–02/08

Table 9. Pin Conditions in Special Operating Modes

Mode Port 0 Port 1 Port 2 Port 3 Port 4 ALE PSEN#

Reset Floating High High High High High High

Idle

(internal

code)

Data Data Data Data Data High High

Idle

(external

code)

Floating Data Data Data Data High High

Power-

Down(inter

nal code)

Data Data Data Data Data Low Low

Power-

Down

(external

code)

Floating Data Data Data Data Low Low