參數(shù)資料
型號(hào)： IS80C31
廠商： Integrated Silicon Solution, Inc.
英文描述： CMOS SINGLE CHIP 8-BIT MICROCONTROLLER
中文描述： CMOS單芯片8位微控制器
文件頁(yè)數(shù)： 5/43頁(yè)
文件大小： 337K
代理商： IS80C31
IS80C51
IS80C31
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC003-1D
11/19/98
5
ISSI
Table 1. Detailed Pin Description
Symbol
PDIP
PLCC
PQFP
I/O
Name and Function
ALE
30
33
27
I/O
Address Latch Enable:
Output pulse for latching the low byte
of the address during an address to the external memory. In
normal operation, ALE is emitted at a constant rate of 1/6 the
oscillator frequency, and can be used for external timing or
clocking. Note that one ALE pulse is skipped during each
access to external data memory.
EA
31
35
29
I
External Access enable:
EA
must be externally held low to
enable the device to fetch code from external program memory
locations 0000H to FFFFH. If
EA
is held high, the device
executes from internal program memory unless the program
counter contains an address greater than 0FFFH.
P0.0-P0.7
39-32
43-36
37-30
I/O
Port 0:
Port 0 is an 8-bit open-drain, bidirectional I/O port. Port
0 pins that have 1s written to them float and can be used as high-
impedance inputs. Port 0 is also the multiplexed low-order
address and data bus during accesses to external program and
data memory. In this application, it uses strong internal pullups
when emitting 1s.
P1.0-P1.7
1-8
2-9
40-44
1-3
I/O
Port 1:
Port 1 is an 8-bit bidirectional I/O port with internal
pullups. Port 1 pins that have 1s written to them are pulled high
by the internal pullups and can be used as inputs. As inputs,
Port 1 pins that are externally pulled low will source current
because of the internal pullups. (See DC Characteristics: I
IL
).
The Port 1 output buffers can sink/source four TTL inputs.
Port 1 also receives the low-order address byte during ROM
verification.
P2.0-P2.7
21-28
24-31
18-25
I/O
Port 2:
Port 2 is an 8-bit bidirectional I/O port with internal
pullups. Port 2 pins that have 1s written to them are pulled high
by the internal pullups and can be used as inputs. As inputs,
Port 2 pins that are externally pulled low will source current
because of the internal pullups. (See DC Characteristics: I
IL
).
Port 2 emits the high order address byte during fetches from
external program memory and during accesses to external data
memory that used 16-bit addresses (MOVX @ DPTR). In this
application, Port 2
uses strong internal pullups when emitting
1s. During accesses to external data memory that use 8-bit
addresses (MOVX @ Ri [i = 0, 1]), Port 2 emits the contents of
the P2 Special Function Register.
Port 2 also receives the high-order bits and some control
signals during ROM verification.
相關(guān)PDF資料
PDF描述
IS80C31-12PL CMOS SINGLE CHIP 8-BIT MICROCONTROLLER
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IS80C31-12PL 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER
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IS80C31-12PQ 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER
IS80C31-12PQI 制造商:ISSI 制造商全稱(chēng):Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER
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