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
文件頁數(shù)： 13/148頁
文件大小： 1664K
代理商： ST92186B3BK
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ST92186B - GENERAL DESCRIPTION
PIN DESCRIPTION (Cont’d)
1.2.1 I/O Port Configuration
All ports can be individually configured as input, bi-
directional, output, or alternate function. Refer to
the Port Bit Configuration Table in the I/O Port
Chapter.
No I/O pins have any physical weak pull-up capa-
bility (they will show no pull-up if they are pro-
grammed in the "weak pull-up" software mode).
Input levels can be selected on a bit basis by
choosing between TTL or CMOS input levels for I/
O port pin except for P2.(5:4,0), P3.(6:4,1:0),
P4.(1:0) which are implemented with a Schmitt
trigger function.
All port output configurations can be software se-
lected on a bit basis to provide push-pull or open
drain driving capabilities. For all ports, when con-
figured as open-drain, the voltage on the pin must
never exceed the VDD power line value (refer to
Electrical characteristics section).
Warning:
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.
1.2.2 I/O Port Reset State
I/Os are reset asynchronously as soon as the RE-
SET pin is asserted low.
All I/Os are forced by the Reset in "weak pull-up"
configuration mode (but some are in high imped-
ance due to the lack of physical pull-up) except
P5.0 (refer to the Reset section) which is forced
into the "Push-Pull Alternate Function" mode until
being reconfigured by software.
Warning:
When a common pin is declared to be connected
to an alternate function input and to an alternate
function output, the user must be aware of the fact
that the alternate function output signal always in-
puts to the alternate function module declared as
input.
When any given pin is declared to be connected to
a digital alternate function input, the user must be
aware of the fact that the alternate function input is
always connected to the pin. When a given pin is
declared to be connected to an analog alternate
function input (ADC input for example) and if this
pin is programmed in the "AF-OD" mode, the digit-
al input path is disconnected from the pin to pre-
vent any DC consumption.
Table 3. I/O Port Characteristics
Legend: OD = Open Drain, AF = Alternate Function
Input
Output
Weak Pull-Up
Reset State
Port 0[4:3]
TTL/CMOS
Push-Pull/OD
No
Bidirectional
Port 2.0
Port 2[3:1]
Port 2[5:4]
Port 2[7:6]
Schmitt trigger
TTL/CMOS
Schmitt trigger
TTL/CMOS
Push-Pull/OD
No
Bidirectional
Port 3[0:1]
Port 3.2
Port 3[6:4]
Port 3.7
Schmitt trigger
TTL/CMOS
Schmitt trigger
TTL/CMOS
Push-Pull/OD
No
Bidirectional
Port 4[1:0]
Port 4[7:6]
Schmitt trigger
TTL/CMOS
Push-Pull/OD
No
Bidirectional
Port 5.0
Port 5[2:1]
Port 5[6:5]
TTL/CMOS
Push-Pull/OD
No
Push-Pull AF Out
Bidirectional
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