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PDF 83C51KB Data sheet ( Hoja de datos )
| Número de pieza | 83C51KB | |
| Descripción | HIGH PERFORMANCE KEYBOARD MICROCONTROLLER | |
| Fabricantes | Intel Corporation | |
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83C51KB
HIGH PERFORMANCE
KEYBOARD MICROCONTROLLER
s Direct Drive LED Outputs
— Four Pins (P3.7:4)
— 13 mA Typical Current Sink
Capability
s 20 pF Cap On-chip for RC Resonator
— Frequency Selectable (4-6 MHz)
s 8 Dedicated Key Scan Input (KSI) Pins
— Schmitt-trigger Inputs
— External Interrupt
— Level Detect Interrupt Mode for
Automatic Power-down Exit
s 16 Dedicated Key Scan Output (KSO)
Pins with Quasi-bidirectional Port
Drivers
— No External Resistor Required
— Located on P0.7:0 and P2.7:0
s 4-Kbyte On-chip ROM Memory
s 128-byte On-chip RAM Memory
s Clock/Data Drivers to Motherboard
— Strong Pullup Drivers for Keyboard
Cable Communication
— 8X42 Compatible Interface
— Selectable external interrupt for
Clock
s ONCE mode (On-chip Emulation)
s Power-on Reset Mode
— Automatic Operation
s 5 Volt D.C. Operation
s Reduces Manufacturing Cost by
Reducing Overall Component Count
s Configurable Timer (16 bit or 2 by 8 Bit)
s Uses Industry Standard Design Tools
s Control Oriented Instruction Set
s Industry Standard Architecture
The 83C51KB is a highly integrated keyboard microcontroller for the standard and advanced desktop
keyboard industry. The integration of external components into the microcontroller reduces overall keyboard
control system manufacturing cost in terms of the number of components used, the amount of PCB space
required, reduced inventory, and a reduction in required assembly activities. In addition, the integration
reduces the number and amount of software routines needed for signal debounce and input status poll
operation. There is a resultant reduction in CPU overhead as well as on-chip memory requirements. The
83C51KB product line is manufactured with Intel state of the art complimentary high-performance metallic
oxide semiconductor (CHMOS) design rules.
Information in this document is provided in connection with Intel products. Intel assumes no liability whatsoever, including infringement of
any patent or copyright, for sale and use of Intel products except as provided in Intel’s Terms and Conditions of Sale for such products.
Intel retains the right to make changes to these specifications at any time, without notice. Microcontroller products may have minor varia-
tions to this specification known as errata.
COPYRIGHT © INTEL CORPORATION, 1996
March 1996
Order Number: 272800-001
1 page  
83C51KB HIGH PERFORMANCE KEYBOARD MICROCONTROLLER
4.0 83C51KB MEMORY
Code
Memory
Description
Table 3. 83C51KB Memory Map
FFFFH
0000H
External code memory
0FFFH
0000H
4-Kbyte on-chip code memory array.
Data
Memory
Description
FFFFH
0000H
External data memory
00FFH
0080H
Special function registers
007FH
0020H
On-chip RAM
001FH
0000H
4 banks of general purpose registers, R0-R7
NOTE:
1. The special function registers (SFRs) are accessible by direct addressing only.
2. Data in this area is accessible by indirect addressing only.
3. RD#/WR# active for these external data addresses.
4. PSEN# active for the external code addresses.
5. Addresses 20H through 2FH are bit addressable.
Notes
4
2, 3
1
5
5
5 Page 
83C51KB HIGH PERFORMANCE KEYBOARD MICROCONTROLLER
RCIN Frequency vs. Resistance
7
6.5
6
5.5
5
4.5
4
3.5
3
5 6 7 8 9 10
Resistance (KOhm)
A4250-01
NOTE:
Figure 3. RCIN Frequency
RC resonator accuracy is ± 5% at fixed VCC and temperature using a 1% external precision resistor.
11
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