ST72F324BJ STMICROELECTRONICS [STMicroelectronics], ST72F324BJ Datasheet - Page 172

• Manufacturer Part Number: ST72F324BJ
• Description: 8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Device configuration and ordering information
14
14.1
14.1.1
Table 118. Flash option bytes
1. Depends on device type as defined in
172/188
Default
HALT
7
1
WDG
Each device is available for production in user programmable versions (Flash) as well as in
factory coded versions (ROM/FASTROM).
ST72324B devices are ROM versions. ST72P324B devices are Factory Advanced Service
Technique ROM (FASTROM) versions: They are factory-programmed HDFlash devices.
Flash devices are shipped to customers with a default content (FFh), while ROM factory
coded parts contain the code supplied by the customer. This implies that Flash devices have
to be configured by the customer using the Option bytes while the ROM devices are factory-
configured.
Flash devices
Flash configuration
The option bytes allow the hardware configuration of the microcontroller to be selected.
They have no address in the memory map and can be accessed only in programming mode
(for example using a standard ST7 programming tool). The default content of the Flash is
fixed to FFh. To program directly the Flash devices using ICP, Flash devices are shipped to
customers with the internal RC clock source. In masked ROM devices, the option bytes are
fixed in hardware by the ROM code (see option list).
Table 119. Option byte 0 bit description
Device configuration and ordering information
OPT7
OPT6
OPT5
Bit
SW
6
1
Res
Static option byte 0
5
1
WDG HALT
WDG SW
Name
4
1
0
-
VD
Table 121: Package selection (OPT7) on page 174.
3
0
0
Watchdog reset on HALT
Hardware or software Watchdog
Reserved, must be kept at default value.
Reserved
2
1
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
This option bit selects the Watchdog type.
0: Hardware (Watchdog always enabled)
1: Software (Watchdog to be enabled by software)
1
1
0
1
PKG1
note
See
7
1
6
1
Function
OSCTYPE
Static option byte 1
5
1
1
4
0
0
3
2
0
OSCRANGE
2
1
1
ST72324B
1
0
1
0
1