ST10F269Z2 STMicroelectronics, ST10F269Z2 Datasheet - Page 60

• Manufacturer Part Number: ST10F269Z2
• Description: 16-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST10F269Z2

• Single Voltage Supply: 5V ±10% (EMBEDDED REGULATOR FOR 2.7 or 3.3 V CORE SUPPLY).
• Temperature Ranges: -40 +125 °C / -40 to 85 °C

12 - PARALLEL PORTS
Figure 20 : Hysteresis for Special Input Thresholds
12.2.3 - 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:
Edge characteristic defines the rise/fall time for
the respective output. Slow edges reduce the
peak currents that are sinked/sourced when
changing the voltage level of an external
capacitive load. For a bus interface or pins that are
changing
however, fast edges may still be required.
Driver characteristic defines either the general
driving capability of the respective driver, or if the
POCONx (F0yyh / zzh) for 8-bit Ports
POCONx (F0yyh / zzh) for 16-bit Ports
Note: In case of reading an 8 bit P0CONX register, high Byte (bit 15..8) is read as 00h
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PNxEC
PNxDC
15
15
-
PN3DC
RW
Bit
Hysteresis
Input level
Bit state
14
14
-
at frequency higher than
13
13
-
PN3EC
Port Nibble x Edge Characteristic (rise/fall time)
00:
01:
10:
11:
Port Nibble x Driver Characteristic (output current)
00:
01:
10:
11:
RW
12
12
-
Fast edge mode, rise/fall times depend on the size of the driver.
Slow edge mode, rise/fall times ~60 ns
Reserved
Reserved
High Current mode:
Driver always operates with maximum strength.
Dynamic Current mode:
Driver strength is reduced after the target level has been reached.
Low Current mode:
Driver always operates with reduced strength.
Reserved
11
11
-
PN2DC
RW
10
10
-
9
9
-
PN2EC
1MHz,
RW
8
8
-
ESFR
ESFR
driver strength is reduced after the target output
level has been reached or not. Reducing the
driver strength increases the output’s internal
resistance, which
imported via the output line. For driving LEDs or
power transistors, however, a stable high output
current may still be required as described below.
This rise / fall time of 4 I/O pads (a nibble) is
selected using 2-bit named PNxEC. That means
Port Nibble (x = nibble number, it could be 3 as for
Port 2.15 to 2.12) Edge Characteristic.
The sink / source capability of the same 4 I/O
pads is selected using 2-bit named PNxDC. That
means Port Nibble (x = nibble number) Drive
Characteristic (See Table 18).
7
7
PN1DC
PN1DC
Function
RW
RW
6
6
5
5
PN1EC
PN1EC
RW
RW
4
4
attenuates
3
3
PN0DC
PN0DC
RW
RW
Reset Value: 0000h
Reset Value: --00h
2
2
noise
ST10F269
1
1
PN0EC
PN0EC
RW
RW
that
0
0
is