AT89LP428-20MU ATMEL [ATMEL Corporation], AT89LP428-20MU Datasheet - Page 145

• Manufacturer Part Number: AT89LP428-20MU
• Description: 8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

3654A–MICRO–8/09
1
2
3
4
5
6
7
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 5
Memory Organization .............................................................................. 8
Special Function Registers ................................................................... 15
Enhanced CPU ....................................................................................... 16
System Clock ......................................................................................... 20
Reset ....................................................................................................... 23
1.1
1.2
1.3
1.4
1.5
2.1
2.2
3.1
3.2
3.3
3.4
5.1
5.2
6.1
6.2
6.3
6.4
6.5
7.1
7.2
7.3
7.4
7.5
28P3 – 28-lead PDIP .........................................................................................2
32A – 32-lead TQFP (Top View) .......................................................................2
32J – 32-lead PLCC ..........................................................................................2
32M1-A – 32-pad MLF(Top View) .....................................................................2
Pin Description ..................................................................................................3
Block Diagram ...................................................................................................6
Comparison to Standard 8051 ...........................................................................7
Program Memory ...............................................................................................9
Internal Data Memory ......................................................................................10
External Data Memory .....................................................................................11
In-Application Programming (IAP) ...................................................................14
Enhanced Dual Data Pointers .........................................................................17
Restrictions on Certain Instructions .................................................................20
Crystal Oscillator .............................................................................................21
External Clock Source .....................................................................................21
Internal RC Oscillator ......................................................................................22
System Clock Out ............................................................................................22
System Clock Divider ......................................................................................22
Power-on Reset ...............................................................................................23
Brown-out Reset ..............................................................................................25
External Reset .................................................................................................26
Watchdog Reset ..............................................................................................26
Software Reset ................................................................................................26