ST10F269-T3 STMicroelectronics, ST10F269-T3 Datasheet - Page 32

• 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
Figure 7 : Memory Configuration after Reset
5.6.3 - Loading the Startup Code
After sending the identification Byte the BSL
enters a loop to receive 32 Bytes via ASC0. These
Byte are stored sequentially into locations
00’FA40h through 00’FA5Fh of the internal RAM.
So up to 16 instructions may be placed into the
RAM area. To execute the loaded code the BSL
then jumps to location 00’FA40h, which is the first
loaded instruction.
The
terminated, the ST10F269-T3 remains in BSL
mode, however. Most probably the initially loaded
routine will load additional code or data, as an
average
substantially more than 16 instructions. This
second receive loop may directly use the
pre-initialized interface ASC0 to receive data and
store it to arbitrary user-defined locations.
This second level of loaded code may be the final
application code. It may also be another, more
sophisticated,
transmission protocol to enhance the integrity of
the loaded code or data. It may also contain a
code
configuration and enable the bus interface to store
the received data into external memory.
32/162
BSL mode active
EA pin
Code fetch from internal
Flash area
Data fetch from internal
Flash area
bootstrap
sequence
application
loader
loading
to
is
routine
Segment
change
Flash
Test
255
2
1
0
sequence
likely
User Flash access
Test-Flash access
Yes (P0L.4=’0’)
16M Bytes
IRAM
Flash
User
that
High
the
to
Access to:
enabled
internal
adds
is
disabled
Flash
system
external
require
now
bus
a
Segment
Flash
Test
255
2
1
0
This process may go through several iterations or
may directly execute the final application. In all
cases the ST10F269-T3 will still run in BSL mode,
that means with the watchdog timer disabled and
limited access to the internal Flash area.
All code fetches from the internal Flash area
(00’0000h...00’7FFFh or 01’0000h...01’7FFFh, if
mapped to segment 1) are redirected to the
special Boot-ROM. Data fetches access will
access
ST10F269-T3, if any is available, but will return
undefined data on ROMless devices.
5.6.4 - Exiting Bootstrap Loader Mode
In order to execute a program in normal mode, the
BSL mode must be terminated first. The
ST10F269-T3 exits BSL mode upon a software
reset (ignores the level on P0L.4) or a hardware
reset (P0L.4 must be high). After a reset the
ST10F269-T3 will start executing from location
00’0000h of the internal Flash or the external
memory, as programmed via pin EA.
User Flash access
Test-Flash access
Yes (P0L.4=’0’)
IRAM
Flash
16M Bytes
User
Low
the
Access to:
enabled
internal
Flash
external
enabled
internal
bus
Segment
255
2
1
0
Access to application
Boot-ROM
User Flash access
User Flash access
IRAM
Flash
User
No (P0L.4=’1’)
16M Bytes
Access:
depends on
depends on
reset config
reset config
EA, Port0
EA, Port0
of
the