ST10F269Z2 STMicroelectronics, ST10F269Z2 Datasheet - Page 77

• 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

ST10F269
12.7.1 - Alternate Functions of Port 4
During external bus cycles that use segmentation
(address space above 64K Bytes) a number of
Port 4 pins may output the segment address lines.
The number of pins that is used for segment
address output determines the external address
space which is directly accessible. The other pins
of Port 4 may be used for general purpose I/O. If
segment address lines are selected, the alternate
function of Port 4 may be necessary to access
external memory directly after reset. For this
reason Port 4 will be switched to this alternate
function automatically.
Table 21 : Port 4 Alternate Functions
Figure 30 : Port 4 I/O and Alternate Functions
Port 4
P4.0
P4.1
P4.2
P4.3
P4.4
P4.5
P4.6
P4.7
Port 4
Alternate Function
General Purpose
GPIO
GPIO
GPIO
GPIO
GPIO/CAN2_RxD
GPIO/CAN1_RxD
GPIO/CAN1_TxD
GPIO/CAN2_TxD
Input / Output
Standard Function
SALSEL = 01
64K Bytes
P4.7
P4.6
P4.5
P4.4
P4.3
P4.2
P4.1
P4.0
Segment Address A16
Segment Address A17
GPIO
GPIO
GPIO/CAN2_RxD
GPIO/CAN1_RxD
GPIO/CAN1_TxD
GPIO/CAN2_TxD
Alternate Function
SALSEL = 11
256K Bytes
Segment Address
Lines
a)
The number of segment address lines is selected
via PORT0 during reset. The selected value can
be read from bitfield SALSEL in register RP0H
(read only) in order to check the configuration
during run time.
The CAN interfaces use 2 or 4 pins of Port 4 to
interface each CAN Modules to an external CAN
transceiver. In this case the number of possible
segment address lines is reduced.
The Table 21 summarizes the alternate functions
of Port 4 depending on the number of selected
segment
SALSEL)
A23
A22
A21
A20
A19
A18
A17
A16
Segment. Address A16
Segment Address A17
Segment Address A18
Segment Address A19
GPIO/CAN2_RxD
GPIO/CAN1_RxD
GPIO/CAN1_TxD
GPIO/CAN2_TxD
Alternate Function
SALSEL = 00
address
1M Byte
Cans I/O and General Purpose
Input / Output
12 - PARALLEL PORTS
lines
b)
Segment Address A16
Segment Address A17
Segment Address A18
Segment Address A19
Segment Address A20
Segment Address A21
Segment Address A22
Segment Address A23
(coded
Alternate Function
CAN2_TxD
CAN1_TxD
CAN1_RxD
CAN2_RxD
-
-
-
-
SALSEL = 10
16M Bytes
via
bitfield
77/184