參數(shù)資料
型號(hào)： ST92186B3BK
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封裝： PLASTIC, SDIP-32
文件頁(yè)數(shù)： 113/148頁(yè)
文件大?。?/td> 1664K
代理商： ST92186B3BK
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ST92186B - I/O PORTS
6.5 ALTERNATE FUNCTION ARCHITECTURE
Each I/O pin may be connected to three different
types of internal signal:
– Data bus Input/Output
– Alternate Function Input
– Alternate Function Output
6.5.1 Pin Declared as I/O
A pin declared as I/O, is connected to the I/O buff-
er. This pin may be an Input, an Output, or a bidi-
rectional I/O, depending on the value stored in
(PxC2, PxC1 and PxC0).
6.5.2 Pin Declared as an Alternate Function
Input
A single pin may be directly connected to several
Alternate Function inputs. In this case, the user
must select the required input mode (with the
PxC2, PxC1, PxC0 bits) and enable the selected
Alternate Function in the Control Register of the
peripheral. No specific port configuration is re-
quired to enable an Alternate Function input, since
the input buffer is directly connected to each alter-
nate function module on the shared pin. As more
than one module can use the same input, it is up to
the user software to enable the required module
as necessary. Parallel I/Os remain operational
even when using an Alternate Function input. The
exception to this is when an I/O port bit is perma-
nently assigned by hardware as an A/D bit. In this
case , after software programming of the bit in AF-
OD-TTL, the Alternate function output is forced to
logic level 1. The analog voltage level on the cor-
responding pin is directly input to the A/D.
6.5.3 Pin Declared as an Alternate Function
Output
The user must select the AF OUT configuration
using the PxC2, PxC1, PxC0 bits. Several Alter-
nate Function outputs may drive a common pin. In
such case, the Alternate Function output signals
are logically ANDed before driving the common
pin. The user must therefore enable the required
Alternate Function Output by software.
Warning: When a pin is connected both to an al-
ternate function output and to an alternate function
input, it should be noted that the output signal will
always be present on the alternate function input.
6.6 I/O STATUS AFTER WFI, HALT AND RESET
The status of the I/O ports during the Wait For In-
terrupt, Halt and Reset operational modes is
shown in the following table. The External Memory
Interface ports are shown separately. If only the in-
ternal memory is being used and the ports are act-
ing as I/O, the status is the same as shown for the
other I/O ports.
6.7 CONFIGURATION OF UNBONDED I/OS
Some I/Os are not bonded in the SDIP32 pack-
age. You must configure these unbonded I/Os (i.e.
P2.1, P2.2, P3.1, P3.5, P3.7, P5.1, P5.2, P5.5 and
P5.6) as output push-pull at the very first begin-
ning of your software and never change this con-
figuration after initialization. This will avoid unpre-
dictable software behavior.
Mode
I/O Ports
WFI
Not Affected (clock outputs running)
HALT
Not Affected (clock outputs stopped)
RESET
Bidirectional Weak Pull-up (High impedance
when disabled in hardware).
相關(guān)PDF資料
PDF描述
ST92195B2T1/XXX 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP64
ST92195B3B1/XXX 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP56
ST92195B4B1/XXX 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP56
ST92195B5T1/XXX 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP64
ST92195B6T1/XXX 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP64
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ST92195B 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:32-64K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY AND TELETEXT DATA SLICER
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