Datasheet

iii
4127H–8051–02/08
A/T89C51AC2
Analog-to-Digital Converter (ADC) ................................................... 86
Features.............................................................................................................. 86
ADC Port 1 I/O Functions ................................................................................... 86
VAREF................................................................................................................ 86
ADC Converter Operation................................................................................... 88
Voltage Conversion ............................................................................................ 88
Clock Selection ................................................................................................... 88
ADC Standby Mode ............................................................................................ 89
IT ADC Management .......................................................................................... 89
Routines examples ............................................................................................. 89
Registers............................................................................................................. 91
Interrupt System ................................................................................. 93
Introduction......................................................................................................... 93
Registers............................................................................................................. 95
Electrical Characteristics................................................................. 101
Absolute Maximum Ratings*............................................................................. 101
DC Parameters for Standard Voltage ............................................................... 101
DC Parameters for A/D Converter .................................................................... 104
AC Parameters ................................................................................................. 104
Ordering Information........................................................................ 114
Package Drawings............................................................................ 115
VQFP44 ............................................................................................................ 115
PLCC44 ............................................................................................................ 116
Datasheet Change Log for A/T89C51AC2 ...................................... 117
Changes from 4127D - 02/03 to 4127E - 01/05................................................ 117
Changes from 4127E - 01/05 to 4127F - 03/05 ................................................ 117
Changes from 4127F - 03/05 to 4127G - 05/06................................................ 117
Changes from 4127G - 05/06 to 4127H - 02/08 ............................................... 117
Table of Contents .................................................................................. i