N80C251SQ16 Intel, N80C251SQ16 Datasheet - Page 25

• 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

5.3.2
PRELIMINARY
RD#/PSEN#
†
††
†††
P0/A16/A17
During a sequence of page hits, PSEN# remains low until the end of the last page-hit cycle.
state (2T
A page hit (i.e., a code fetch to the same 256-byte "page" as the previous code fetch) requires one
The value of this parameter depends on wait states. See the table of AC characteristics.
EXTERNAL BUS CYCLES, PAGE MODE
XTAL1
ALE
P2
OSC
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
); a page miss requires two states (4T
Figure 10. External Bus Cycle: Code Fetch (Page Mode)
T LHLL †
T AVLL †
Page Miss ††
T AVRL †
T LHAX †
A15:8
A7:0/A16/A17
T AVDV1 †
T AVDV2 †
T LLAX
T RLAZ
T RLDV †
T LLRL †
T OSC
OSC
).
Instruction In
D7:0
Page Hit ††
T AVDV3
A7:0/A16/A17
Instruction In
D7:0
T RHDZ1
T RHDX
A4213-02
†††
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