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參數(shù)資料
| 型號(hào)： | P83C251TQ24 |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 6/36頁 |
| 文件大?。?/td> | 813K |
| 代理商： | P83C251TQ24 |
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8xC251TB/TQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
8
4.0
SIGNALS
Table 6. Signal Descriptions (Sheet 1 of 3)
Signal
Name
Type
Description
Alternate
Function
A17
O
18th Address Bit (A17). Output to memory as 18th external
address bit (A17) in extended bus applications, depending on the values
of bits RD0 and RD1 in configuration byte UCONFIG0. See also RD# and
PSEN#.
P1.7/CEX4/
WCLK
A16
O
Address Line 16. See RD#.
RD#
A15:81
O
Address Lines. Upper address lines for the external bus.
P2.7:0
AD7:01
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.
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.
P1.6:4
P1.7/A17/
WAIT#
P1.3/TXD1
EA#
I
External Access. Directs program memory accesses to on-chip or off-
chip code memory. For EA# = 0, all program memory accesses are off-
chip. For EA# = 1, an access is to on-chip ROM if the address is within
the range of the on-chip ROM; otherwise the access is off-chip. The value
of EA# is latched at reset. For devices without on-chip ROM, EA# must
be strapped to ground.
ECI
I
PCA External Clock Input. External clock input to the 16-bit PCA timer.
P1.2/RXD1
INT1:0#
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#/INT0#. If bits INT1:0 are clear, bits IE1:0 are set by
a low level on INT1:0#.
P3.3:2
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/RXD1
CEX3:1
CEX4/A17/
WAIT#/
WCLK
CEX0/TXD1
P2.7:0
I/O
Port 2. This is an 8-bit, bidirectional I/O port with internal pullups.
A15:8
P3.0
P3.1
P3.3:2
P3.5:4
P3.6
P3.7
I/O
Port 3. This is an 8-bit, bidirectional I/O port with internal pullups.
RXD
TXD
INT1:0#
T1:0
WR#
RD#/A16
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