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ST72344S2 Datasheet(PDF) 232 Page - STMicroelectronics

Part # ST72344S2
Description  SCI asynchronous serial interface
PDF  247 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72344S2 Datasheet(HTML) 232 Page - STMicroelectronics

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Device configuration and ordering information
ST72344xx, ST2345xx
232/247
Doc ID 12321 Rev 6
15
Device configuration and ordering information
Each device is available for production in user programmable versions (Flash).
ST72F34x Flash devices are shipped to customers with a default content (FFh). This implies
that Flash devices have to be configured by the customer using the Option Bytes.
15.1
Option bytes
The four option bytes allow the hardware configuration of the microcontroller to be selected.
The option bytes can be accessed only in programming mode (for example using a standard
ST7 programming tool).
15.1.1
Option byte 0
OPT7 = WDG Halt Watchdog Reset on Halt
This option bit determines if a reset is generated when entering Halt mode while the
Watchdog is active.
0: No Reset generation when entering Halt mode
1: Reset generation when entering Halt mode
OPT6 = WDG SW Hardware or Software Watchdog
This option bit selects the watchdog type.
0: Hardware (watchdog always enabled)
1: Software (watchdog to be enabled by software)
OPT5:4 = LVD[1:0] Low voltage detection selection
These option bits enable the LVD block with a selected threshold as shown in
Table 119.
OPT3:2 = SEC[1:0] Sector 0 size definition
These option bits indicate the size of sector 0 according to the following table.
Table 119.
LVD threshold configuration
Configuration
LVD1
LVD0
LVD Off
11
Highest voltage threshold (
∼4.1V)
1
0
Medium voltage threshold (
∼3.5V)
0
1
Lowest voltage threshold (
∼2.8V)
0
0
Table 120.
Size of sector 0
Sector 0 size
SEC1
SEC0
0.5k
00
1k
01



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