83C151SB Intel Corporation, 83C151SB Datasheet - Page 11

• Manufacturer Part Number: 83C151SB
• Description: HIGH-PERFORMANCE CHMOS MICROCONTROLLER
• Manufacturer: Intel Corporation

V
V
V
WR
XTAL1
XTAL2
Signal
Name
The descriptions of A15 8 P2 7 0 and AD7 0 P0 7 0 are for the nonpage-mode chip configuration (compatible with
44-lead PLCC and 40-pin DIP MCS 51 microcontrollers) If the chip is configured for page-mode operation port 0 carries
the lower address bits (A7 0) and port 2 carries the upper address bits (A15 8) and the data (D7 0)
SS
SS1
SS2
Type
GND
GND
GND
O
O
I
Circuit Ground Connect this pin to ground
Secondary Ground This ground is provided to reduce ground bounce
and improve power supply bypassing Connection of this pin to ground
is recommended However when using the 8XC151SA SB as a pin-
for-pin replacement for the 8XC51BH V
without loss of compatibility (Not available on DIP)
Secondary Ground 2 This ground is provided to reduce ground
bounce and improve power supply bypassing Connection of this pin to
ground is recommended However when using the 8XC151SA SB as
a pin-for-pin replacement for the 8XC51FX V
without loss of compatibility (Not available on DIP)
Write Write signal output to external memory
Input to the On-chip Inverting Oscillator Amplifier To use the
internal oscillator a crystal resonator circuit is connected to this pin If
an external oscillator is used its output is connected to this pin XTAL1
is the clock source for internal timing
Output of the On-chip Inverting Oscillator Amplifier To use the
internal oscillator a crystal resonator circuit is connected to this pin If
an external oscillator is used leave XTAL2 unconnected
8XC151SA SB HIGH-PERFORMANCE CHMOS MICROCONTROLLER
Table 7 Signal Descriptions (Continued)
Description
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SS1
can be unconnected
SS2
can be unconnected
Multiplexed
With
P3 6
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