参数资料
型号: ST72621L4T1
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, PQFP44
封装: TQFP-44
文件页数: 32/134页
文件大小: 815K
代理商: ST72621L4T1
ST7262
127/134
14 DEVICE CONFIGURATION AND ORDERING INFORMATION
Each device is available for production in ROM
versions, in user programmable versions (FLASH)
as well as in factory coded versions (FASTROM).
FLASH devices are shipped to customers with a
default content (FFh), while FASTROM factory
coded parts contain the code supplied by the cus-
tomer. This implies that FLASH devices have to be
configured by the customer using the Option Byte
while the ROM devices are factory-configured.
14.1 Option Byte
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 using a standard ST7 programming tool.
The default content of the FLASH is fixed to FFh.
This means that all the options have “1” as their
default value.
In FASTROM devices, the Option Byte is fixed in
hardware by the FASTROM code.
OPTION BYTE
Bits 7:6 = Reserved.
Bit 5 = WDGSW
Hardware or software watchdog
This option bit selects the watchdog type.
0: Hardware enabled
1: Software enabled
Bit 4= Reserved.
Bit 3 = LVD
Low Voltage Detector selection
This option bit selects the LVD.
0: LVD enabled
1: LVD disabled
Bit 2= Reserved.
Bit 1 = OSC12/6
Oscillator selection
This option bit selects the clock divider used to
drive the USB interface at 6MHz.
0: 6 MHz oscillator (no divider for USB)
1: 12 Mhz oscillator (2 divider for USB)
Bit 0 = FMP_R
Memory Readout Protection
This option bit allows the protection of the software
contents against piracy (program or data). When
the protection is activated, read/write access is
prevented by hardware. If the protection is deacti-
vated, the memory is erased first.
0: Read-out protection enabled
1: Read-out protection disabled
70
--
WDG
SW
1
LVD
-
OSC
12/6
FMP_
R
1
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