ST6285BQ1 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST6285BQ1 Datasheet PDF : 78 Pages
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ST62T85B/E85B
I/O PORTS (Cont’d)
4.1.1 Operating Modes
4.1.1.2 Interrupt Options
Each pin may be individually programmed as input
or output with various configurations.
This is achieved by writing the relevant bit in the
Data (DR), Data Direction (DDR) and Option reg-
isters (OR). Table 12 illustrates the various port
configurations which can be selected by user soft-
ware.
All input lines can be individually connected by
software to the interrupt system by programming
the OR and DR registers accordingly. The inter-
rupt trigger modes (falling edge, rising edge and
low level) can be configured by software as de-
scribed in the Interrupt Chapter for each port.
4.1.1.3 Analog Input Options
4.1.1.1 Input Options
Some pins can be configured as analog inputs by
Pull-up, High Impedance Option. All input lines
can be individually programmed with or without an
programming the OR and DR registers according-
ly. These analog inputs are connected to the on-
internal pull-up by programming the OR and DR chip 8-bit Analog to Digital Converter. ONLY ONE
registers accordingly. If the pull-up option is not pin should be programmed as an analog input at
selected, the input pin will be in the high-imped- any time, since by selecting more than one input
ance state.
simultaneously their pins will be effectively short-
) Table 12. I/O Port Option Selection
t(s DDR
OR
c 0
0
du 0
0
ro 0
1
P 0
1
te 1
0
le 1
1
DR
Mode
0
Input
1
Input
0
Input
1
Input
X
Output
X
Output
Obsolete Product(s) - Obso Note: X = Don’t care
ed.
Option
With pull-up, no interrupt
No pull-up, no interrupt
With pull-up and with interrupt
Analog input (when available)
Open-drain output (20mA sink when available)
Push-pull output (20mA sink when available)
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