參數(shù)資料
型號(hào)： P87C151SB
廠商： INTEL CORP
元件分類(lèi)： 微控制器/微處理器
英文描述： HIGH-PERFORMANCE CHMOS MICROCONTROLLER
中文描述： 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁(yè)數(shù)： 9/33頁(yè)
文件大?。?/td> 312K
代理商： P87C151SB
8XC151SA/SB HIGH-PERFORMANCE CHMOS MICROCONTROLLER
SIGNAL DESCRIPTIONS
Table 7. Signal Descriptions
Signal
Name
Type
Description
Multiplexed
With
A15:8
2
O
Address Lines.
Upper address lines for the external bus.
P2.7:0
AD7:0
2
I/O
Address/Data Lines.
Multiplexed lower address lines and data lines
for external memory.
P0.7:0
ALE
O
Address Latch Enable.
ALE signals the start of an external bus
cycle and indicates that valid address information is available on lines
A15:8 and AD7:0. An external latch can use ALE to demultiplex the
address from the address/data bus.
PROG
Y
CEX4:0
I/O
Programmable Counter Array (PCA) Input/Output Pins.
These
are input signals for the PCA capture mode and output signals for the
PCA compare mode and PCA PWM mode.
P1.6:3
P1.7
EA
Y
I
External Access.
Directs program memory accesses to on-chip or
off-chip code memory. For EA
Y
e
0, all program memory accesses
are off-chip. For EA
Y
e
1, an access is to on-chip ROM/OTPROM if
the address is within the range of the on-chip ROM/OTPROM;
otherwise the access is off-chip. The value of EA
Y
is latched at
reset. For devices without on-chip ROM/OTPROM, EA
Y
must be
strapped to ground.
V
PP
ECI
I
PCA External Clock Input.
External clock input to the 16-bit PCA
timer.
P1.2
INT1:0
Y
I
External Interrupts 0 and 1.
These inputs set bits IE1:0 in the TCON
register. If bits IT1:0 in the TCON register are set, bits IE1:0 are set by
a falling edge on INT1
Y
/INT0
Y
. If bits INT1:0 are clear, bits IE1:0
are set by a low level on INT1:0
Y
.
P3.3:2
PROG
Y
I
Programming Pulse.
The programming pulse is applied to this pin
for programming the on-chip OTPROM.
ALE
P0.7:0
I/O
Port 0.
This is an 8-bit, open-drain, bidirectional I/O port.
AD7:0
P1.0
P1.1
P1.2
P1.7:3
I/O
Port 1.
This is an 8-bit, bidirectional I/O port with internal pullups.
T2
T2EX
ECI
CEX3:0
CEX4
P2.7:0
I/O
Port 2.
This is an 8-bit, bidirectional I/O port with internal pullups.
A15:8
2
The descriptions of A15:8/P2.7:0 and AD7:0/P0.7:0 are for the nonpage-mode chip configuration (compatible with
44-lead PLCC and 40-pin DIP MCS 51 microcontrollers). If the chip is configured for page-mode operation, port 0 carries
the lower address bits (A7:0), and port 2 carries the upper address bits (A15:8) and the data (D7:0).
9
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