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83C51KB

更新时间： 2022-11-29 01:24:46
品牌 Logo 应用领域
英特尔 - INTEL /
页数 文件大小 规格书
19页 253K
描述
HIGH PERFORMANCE KEYBOARD MICROCONTROLLER

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83C51KB HIGH PERFORMANCE KEYBOARD MICROCONTROLLER  
Table 6. 83C51KB Signal Description  
Signal  
Alternate  
Function  
Type  
Description  
Name  
†
A15:8  
O
Address Signals . Upper address lines for the external bus. These  
signals are normally used for the KSO15:8 scan function and are not  
available for external memory access in a keyboard application. (See  
KSO signals).  
KSO.15:8  
P2.15:8  
†
AD7:0  
I/O  
O
Address/Data Signals. Multiplexed lower address and data signals  
KSO.7:0  
for external memory. These signals are normally used for the KSO7:0 P0.7:0  
scan function and are not available for external memory access in a  
keyboard application. (See KSO)  
†
ALE  
Address Latch Enable. ALE signals the start of an external bus cycle  
and indicates that valid address information is available on lines A15:8  
and AD7:0. Since these external address signals are normally used for  
the KSO scan function, the ALE should not be used for external mem-  
ory access in a keyboard application. ALE can be disabled when not  
used for external memory access by setting bit 0 of SFR AUXR at  
address 8EH.  
CLK1:0  
P3.3:2  
I/O  
Clock signal. Either P3.2 or P3.3 is configurable with a 1.8KΩ pullup  
and with external interrupt INT0# or INT1# and used as keyboard CLK  
signal.  
INT1:0#  
DATA  
P3.0  
I/O  
I
DATA signal. P3.0 is configurable with a 1.8KΩ pullup and used as key-  
board Data signal..  
EA#  
External Access. Directs program memory accesses to on-chip or off-  
chip code memory. For EA# = 0, all program memory accesses are off-  
chip. EA# should always be strapped to V for keyboard applications  
CC  
using the 83C51KB.  
†
INT1:0#  
I
External Interrupts 0 and 1. These inputs set bits IE1:0 in the TCON CLK1:0  
register. If bits IT1:0 in the TCON register are set, bits IE1:0 are set by P3.3:2  
a falling edge on INT1#/INT0#. If bits INT1:0 are clear, bits IE1:0 are  
set by a low level on INT1:0#. For keyboard applicaitons, these signals  
are normally used for the CLK signals. (See KSIINT and CDPU bits in  
the PCON register)  
KSI7:0  
P1.7:0  
I/O  
I/O  
Keyboard Scan Inputs. Application specific keyboard signals.  
KSO15:0  
P2.15:8  
P0.7:0  
Keyboard Scan Outputs. The KSO signals are application specific to  
keyboard scan functions.  
LED3:0  
P3.7:4  
I/O  
Light Emitting Diode Drivers. The LED signals are specifically designed to RD#, WR#,  
drive LEDs connected to Vcc directly (see D.C. Characteristics). The  
alternate functions are not available for keyboard applications.  
T0  
N/C  
—
No Connection Signal. This signal is to be unconnected.  
†
P0.7:0  
I/O  
Port 0. This is an 8-bit quasi-bidirectional I/O port (see KSO signals,  
AD7:0  
A15:8  
see also AD7:0).  
P1.7:0  
I/O  
I/O  
Port 1. This is an 8-bit quasi-bidirectional I/O port (see KSI signals).  
Port 2. This is an 8-bit quasi-bidirectional I/O port (see also A15:8).  
P2.7:0  
†
The descriptions of RD#, WR#, ALE, P’SEN#, A15:8/P2.7:0 and AD7:0/P0.7:0 are documented for the  
standard MCS 51 microcontrollers. They are not used for these functions in keyboard applications.  
8
1...567891011...19

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