N80C251SQ16 Intel, N80C251SQ16 Datasheet - Page 13

• Manufacturer Part Number: N80C251SQ16
• Description: IC MPU 8-BIT 5V 16MHZ 44-PLCC
• Manufacturer: Intel
• Series: 80Cr

Specifications of N80C251SQ16

• Rohs Status: RoHS non-compliant
• Core Processor: MCS 251
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SIO
• Peripherals: PWM, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Other names: 804459

RD1:0
PRELIMINARY
0 0
0 1
1 0
1 1
A17
P1.7/CEX4/
WCLK
P1.7/CEX4/
WCLK
P1.7/CEX4/
WCLK
A17/WCLK
P1.7/CEX/
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
A16
A16
P3.7 only
RD# asserted
for addresses
P3.7/RD#/A16
7F:FFFFH
Table 7. Memory Signal Selections (RD1:0)
Asserted for
all addresses
Asserted for
all addresses
Asserted for
all addresses
Asserted for
80:0000H
PSEN#
Asserted for writes to
all memory locations
Asserted for writes to
all memory locations
Asserted for writes to
all memory locations
Asserted only for
writes to MCS 51
microcontroller data
memory locations.
WR#
256-Kbyte external
memory
128-Kbyte external
memory
64-Kbyte external
memory. One
additional port pin.
64-Kbyte external
memory. Compatible
with MCS 51 micro-
controllers.
Features
13