ST10F269-T3 STMicroelectronics, ST10F269-T3 Datasheet - Page 60

• Manufacturer Part Number: ST10F269-T3
• Manufacturer: STMicroelectronics

Specifications of ST10F269-T3

• Cpu Family: ST10
• Device Core Size: 16b
• Frequency (max): 32MHz
• Interface Type: ASC/I2C/SSC
• Program Memory Type: Flash
• Program Memory Size: 256KB
• Total Internal Ram Size: 12KB
• # I/os (max): 111
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 16-chx10-bit
• Instruction Set Architecture: CISC/RISC
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 144
• Package Type: TQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

ST10F269-T3
12.2.4 - Alternate Port Functions
Each port line has one associated programmable
alternate input or output function.
– PORT0 and PORT1 may be used as address
– Port 2, Port 7 and Port 8 are associated with the
– Port 3 includes the alternate functions of timers,
– Port 4 outputs the additional segment address
– Port 5 is used as analog input channels of the
– Port 6 provides optional bus arbitration signals
If an alternate output function of a pin is to be
used,
programmed for output (DPx.y=‘1’), except for
some signals that are used directly after reset and
are configured automatically. Otherwise the pin
remains in the high-impedance state and is not
effected by the alternate output function. The
respective port latch should hold a ‘1’, because its
output is ANDed with the alternate output data
(except for PWM output signals).
If an alternate input function of a pin is used, the
direction of the pin must be programmed for input
(DPx.y=‘0’) if an external device is driving the pin.
The input direction is the default after reset. If no
external device is connected to the pin, however,
one can also set the direction for this pin to output.
SINGLE_BIT: BSET
BIT_GROUP:
Note: When using several BSET pairs to control more pins of one port, these pairs must be separated by
60/162
and data lines when accessing external memory.
capture inputs or compare outputs of the CAP-
COM units and/or with the outputs of the PWM
module.
Port 2 is also used for fast external interrupt in-
puts and for timer 7 input.
serial interfaces, the optional bus control signal
BHE and the system clock output (CLKOUT).
bit A16 to A23 in systems where segmentation
is enabled to access more than 64K Bytes of
memory.
A/D converter or as timer control signals.
(BREQ, HLDA, HOLD) and chip select signals.
instructions, which do not apply to the respective port (See Chapter 6 - Central Processing Unit
(CPU)).
the
direction
BSET
BFLDH
BFLDH
of
P4.7
DP4.7
P4, #24H, #24H
DP4, #24H, #24H
this
pin
must
be
; Initial output level is "high"
; Switch on the output driver
; Initial output level is "high"
; Switch on the output drivers
In this case, the pin reflects the state of the port
output latch. Thus, the alternate input function
reads the value stored in the port output latch.
This can be used for testing purposes to allow a
software trigger of an alternate input function by
writing to the port output latch.
On most of the port lines, the application software
must set the proper direction when using an
alternate input or output function of a pin. This is
done by setting or clearing the direction control bit
DPx.y of the pin before enabling the alternate
function. There are port lines, however, where the
direction of the port line is switched automatically.
For instance, in the multiplexed external bus
modes of PORT0, the direction must be switched
several times for an instruction fetch in order to
output the addresses and to input the data.
Obviously,
instructions. In these cases, the direction of the
port line is switched automatically by hardware if
the alternate function of such a pin is enabled.
To determine the appropriate level of the port
output latches check how the alternate data
output is combined with the respective port latch
output.
There is one basic structure for all port lines
supporting only one alternate input function. Port
lines with only one alternate output function,
however, have different structures. It has to be
adapted to support the normal and the alternate
function features.
All port lines that are not used for these alternate
functions may be used as general purpose I/O
lines. When using port pins for general purpose
output, the initial output value should be written to
the port latch prior to enabling the output drivers,
in order to avoid undesired transitions on the
output pins. This applies to single pins as well as
to pin groups (see examples below).
this
cannot
be
done
through