N80C251TB24 Intel, N80C251TB24 Datasheet - Page 30

• 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

8xC251TB/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
6.3.3
6.3.4
24
Definition of Real-Time Wait Symbols
External Bus Cycles, Real-Time Wait States
RD#/PSEN#
Figure 11. External Bus Cycle: Code Fetch/Data Read (Nonpage Mode)
WAIT#
WCLK
ALE
P0
P2
Table 12. Real-time Wait Timing Symbol Definitions
A
D
C
Y
W
R
Signals
Address
Data
WCLK
WAIT#
WR#
RD#/PSEN#
A7:0
State 1
T
T
RLYX
RLYX
T
RLYV
max
min
A15:8
State 2
D7:0
L
X
V
T
CLYV
Conditions
Low
Hold
Setup
T
CLYX
RD#/PSEN#
stretched
stretched
State 3
min
T
CLYX
max
stretched
State 1 (next cycle)
A7:0
A15:8
A5000-02