KU80C51SL-AH View Datasheet(PDF) - Intel
Part Name
Description
Manufacturer
KU80C51SL-AH Datasheet PDF : 23 Pages
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8XC51SL LOW VOLTAGE 8XC51SL
PIN DESCRIPTIONS
Table 1 Pin Descriptions
Symbol
Type
Description
VSS
Circuit ground potential
VCC
Supply voltage during normal Idle and Power-Down operation nominally a5V
g10% for 8XC51SL a3 3V g 0 3V for Low Voltage 8XC51SL
PCDB0 –7
I O Host interface data bus An 8-bit bidirectional port for data transfers between the
host processor and the keyboard controller
WRL
I The active-low host-interface write signal
RDL
I The active-low host-interface read signal
CSL
I The active-low host-interface chip select
A0 –A1
I Host-Interface Address select inputs
PCOBF
O The active-high host-interface Output Buffer Full interrupt
GATEA20
O Gate A20 control signal output
RCL PROGL
O Host reset active low This pin is also the program pulse input during EPROM
programming
LED0– 3
O LED output drivers
KSI0 –7
I Keyboard input scan lines (input Port 0) Schmitt inputs with 5K – 20K pull-up
resistors
KSO0 –15
O Keyboard output scan lines
PORT 1
P10 A0 –
P17 A7
I O Port 1 is a general-purpose 8-bit bidirectional port with internal pull-ups It also
supports the following user-selectable functions
P10 – P16 are available for connection to dedicated keyboard inputs A0 – A7 output
the low-order address byte (refer to LOADREN signal)
LOADREN
I Low address enable When set high address bits A0 – A7 are output on P10 – P17
PORT2
I O Port 2 is a general-purpose 8-bit bidirectional port with internal pull-ups on P20 – 6
A8– 14 It also supports the following user-selectable functions
P20 –6 A8– 14
P20 – 6 A8– 14 output the high-order address byte
P27 LED4
P27 LED4 is available as a fifth LED output driver (by writing to the port bit 7)
PORT 3
P30 SIF00
P31 SIF01
P32 INT0
P33 SIF10
P34 T0
P35 SIF11
P36 WRL
P37 RDL
I O Port 3 is a general-purpose 8-bit bidirectional port P32 INT0 P34 T0 P36 WRL
and P37 RDL have internal pull-ups P30 SIF00 P31 SIF01 P33 SIF10 and
P35 SIF11 are high-drive open-drain outputs It also supports the following user-
selectable functions
A high-drive open-drain output to support an external serial keyboard interface
(typically CLK) RXD (8051 UART serial input port) SIF0INTL (serial interface
interrupt 0)
A high-drive open-drain output to support an external serial keyboard interface
(typically DATA) TXD (8051 UART serial output port)
INT0L (external interrupt 0)
A high-drive open-drain output to support an external serial keyboard interface
(typically mouse CLK) SIF1INTL (external interrupt 1)
AUXOBF1 (output buffer full mouse support) T0 (Timer Counter 0 external
input)
A high-drive open-drain output to support an external serial keyboard interface
(typically mouse DATA) T1 (Timer Counter 1 external input)
WRL (external data memory write strobe) inactive at addresses 7FF0 – 7FFFH
AUXOBF2 (output buffer full interrupt) INT2L (external interrupt) RDL (external
data memory read strobe) inactive at addresses 7FF0 – FFFFH
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