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ST10F280 Datasheet(PDF) 96 Page - STMicroelectronics

Part # ST10F280
Description  16-bit MCU with MAC unit, 512 Kbyte Flash memory and 18 Kbyte RAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F280 Datasheet(HTML) 96 Page - STMicroelectronics

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Doc ID 8673 Rev. 3
12.1.2
Input threshold control
The standard inputs of the ST10F280 determine the status of input signals according to TTL
levels. In order to accept and recognize noisy signals, CMOS-like input thresholds can be
selected instead of the standard TTL thresholds for all pins of Port 2, Port 3, Port4, Port 7
and Port 8. These special thresholds are defined above the TTL thresholds and feature a
defined hysteresis to prevent the inputs from toggling while the respective input signal level
is near the thresholds.
The Port Input Control register PICON is used to select these thresholds for each byte of the
indicated ports, i.e. the 8-bit ports P7 and P8 are controlled by one bit each while ports P2
and P3 are controlled by two bits each.
PICON
Address:
0xF1C4h / E2h ESFR
Reset:
0x--00h
Type:
R/W
All options for individual direction and output mode control are available for each pin,
independent of the selected input threshold. The input hysteresis provides stable inputs
from noisy or slowly changing external signals.
Figure 28.
Hysteresis for special input thresholds
12.1.3
Output driver control
The port output control registers POCONx allow to select the port output driver
characteristics of a port. The aim of these selections is to adapt the output drivers to the
application’s requirements, and to improve the EMI behaviour of the device. Two
characteristics may be selected:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
-
P8LIN P7LIN
-
P4LIN P3HIN P3LIN P2HIN P2LIN
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PxLIN Port x Low Byte Input Level Selection
0: Pins Px.7...Px.0 switch on standard TTL input levels
1: Pins Px.7...Px.0 switch on special threshold input levels
PxHIN Port x High Byte Input Level Selection
0: Pins Px.15...Px.8 switch on standard TTL input levels
1: Pins Px.15...Px.8 switch on special threshold input levels


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