N80C251TB24 Intel, N80C251TB24 Datasheet - Page 27

• Manufacturer Part Number: N80C251TB24
• Description: IC MPU 8-BIT 5V 24MHZ 44-PLCC
• Manufacturer: Intel
• Series: 80Cr

Specifications of N80C251TB24

• Rohs Status: RoHS non-compliant
• Core Processor: MCS 251
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: SIO
• Peripherals: PWM, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 1K 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: 816721

6.3.2
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
External Bus Cycles, Page Mode
The value of this parameter depends on wait states. See the table of AC characteristics.
A page hit (i.e., a code fetch to the same 256-byte "page" as the previous code fetch) requires one
XTAL1
ALE
P2
OSC
); a page miss requires two states (4T
Figure 8. External Bus Cycle: Code Fetch (Page Mode)
T LHLL †
T AVLL †
Page Miss ††
T AVRL †
8xC251TB/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
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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