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13 DEVICE CONFIGURATION AND ORDERING INFORMATION
Each device is available for production in ROM
versions.
The
user
programmable
version
(FLASH) is supported by the ST72F623F2.
The ROM devices are factory-configured.
The ROM contents are to be sent on diskette, or
by electronic means, with the hexadecimal file in
.S19 format generated by the development tool.
All unused bytes must be set to FFh.
The selected options are communicated to STMi-
croelectronics using the correctly completed OP-
TION LIST appended.
Refer to application note AN1635 for information
on the counter listing returned by ST after code
has been transferred.
The STMicroelectronics Sales Organization will be
pleased to provide detailed information on con-
tractual points.
13.1 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.
OPTION BYTE
Bit 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
Important Note: The LVD must always be ena-
bled (LVD bit programmed at 0).
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 Read out 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 and the device
can be reprogrammed. Refer to the ST7 Flash
Programming Reference Manual.
0: Read-out protection enabled
1: Read-out protection disabled
70
11
WDG
SW
-LVD
-
OSC
12/6
FMP_
R