参数资料
型号: ST72311R9T3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 51/152页
文件大小: 1909K
代理商: ST72311R9T3/XXX
ST72311R, ST72511R, ST72532R
144/152
14 DEVICE CONFIGURATION AND ORDERING INFORMATION
Each device is available for production in user pro-
grammable versions (OTP) as well as in factory
coded versions (ROM). OTP devices are shipped
to customers with a default content (FFh), while
ROM factory coded parts contain the code sup-
plied by the customer. This implies that OTP de-
vices have to be configured by the customer using
the Option Bytes while the ROM devices are facto-
ry-configured.
14.1 OPTION BYTES
The option byte allows the hardware configuration
of the microcontroller to be selected.
The option byte has no address in the memory
map and can be accessed only in programming
mode (for example using a standard ST7 program-
ming tool). The default content of the OTP is fixed
to FFh. This means that all the options have “1” as
their default value.
In masked ROM devices, the option bytes are
fixed in hardware by the ROM code (see option
list). For ROM devices, two other options have to
be specified in the option list:
– LVD enable/disable
– Oscillator source selection
For OTP devices, LVD is selected by different or-
der codes (see Figure 93) and Oscillator Source
selection is not required.
USER OPTION BYTE
Bit 7:6,4 = Reserved
, must always be 1.
Bit 5 = Reserved
, must always be 0.
Bit 3 = FMP
Full memory protection
This option bit allows the protection of the software
contents against piracy (program or data). When
the protection is activated, read-out of the EPROM
or data EEPROM contents is prevented by hard-
ware.
0: Read-out protection enabled
1: Read-out protection disabled
Bit 2 = Reserved
, must always be 1
Bit 1 = 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
Bit 0 = 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)
USER OPTION BYTE
7
0
FMP
WDG HALT
WDG SW
Default
Value
11
1
11
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