P87C51X2BBD NXP Semiconductors, P87C51X2BBD Datasheet - Page 15
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P87C51X2BBD
Manufacturer Part Number
P87C51X2BBD
Description
MCU 8-Bit 87C 80C51 CISC 4KB EPROM 5V 44-Pin LQFP Tray
Manufacturer
NXP Semiconductors
Datasheet
1.P87C52X2BN112.pdf
(62 pages)
Specifications of P87C51X2BBD
Package
44LQFP
Device Core
80C51
Family Name
87C
Maximum Speed
33 MHz
Ram Size
128 Byte
Program Memory Size
4 KB
Operating Supply Voltage
5 V
Data Bus Width
8 Bit
Program Memory Type
EPROM
Number Of Programmable I/os
32
Interface Type
UART
Operating Temperature
0 to 70 °C
Number Of Timers
3
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Company
Part Number
Manufacturer
Quantity
Price
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Part Number:
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ENE
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Company:
Part Number:
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Manufacturer:
NXP Semiconductors
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Philips Semiconductors
2003 Jan 24
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),
low power, high speed (30/33 MHz)
TMOD
*d = 6 in 6-clock mode; d = 12 in 12-clock mode.
Timer n
Gate bit
INTn Pin
BIT
TMOD.3/
TMOD.7
TMOD.2/
TMOD.6
Address = 89H
Not Bit Addressable
OSC
Tn Pin
SYMBOL
GATE
C/T
M1
0
0
1
1
1
TRn
M0
0
1
0
1
1
d*
FUNCTION
Gating control when set. Timer/Counter “n” is enabled only while “INTn” pin is high and
“TRn” control pin is set. when cleared Timer “n” is enabled whenever “TRn” control bit is set.
Timer or Counter Selector cleared for Timer operation (input from internal system clock.)
Set for Counter operation (input from “Tn” input pin).
OPERATING
8048 Timer: “TLn” serves as 5-bit prescaler.
16-bit Timer/Counter: “THn” and “TLn” are cascaded; there is no prescaler.
8-bit auto-reload Timer/Counter: “THn” holds a value which is to be reloaded
into “TLn” each time it overflows.
(Timer 0) TL0 is an 8-bit Timer/Counter controlled by the standard Timer 0 control bits.
TH0 is an 8-bit timer only controlled by Timer 1 control bits.
(Timer 1) Timer/Counter 1 stopped.
Figure 1. Timer/Counter 0/1 Mode Control (TMOD) Register
Figure 2. Timer/Counter 0/1 Mode 0: 13-Bit Timer/Counter
GATE
7
C/T = 0
C/T = 1
C/T
6
TIMER 1
M1
5
M0
4
Control
15
GATE
3
C/T
2
TIMER 0
(5 Bits)
TLn
M1
1
(8 Bits)
THn
P80C3xX2; P80C5xX2;
M0
0
Reset Value = 00H
TFn
SU01580
SU01618
P87C5xX2
Interrupt
Product data