ST6200 STMICROELECTRONICS [STMicroelectronics], ST6200 Datasheet - Page 15

• Manufacturer Part Number: ST6200
• Description: 8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

3.3 OPTION BYTES
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 (00h), 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.
The two option bytes allow the hardware configu-
ration of the microcontroller to be selected.
The option bytes have no address in the memory
map and can be accessed only in programming
mode (for example using a standard ST6 program-
ming tool).
In masked ROM devices, the option bytes are
fixed in hardware by the ROM code (see
11.6.2 "ROM VERSION" on page
fore impossible to read the option bytes.
The option bytes can be only programmed once. It
is not possible to change the selected options after
they have been programmed.
In order to reach the power consumption value in-
dicated in
programmed to its default value. Otherwise, an
over-consumption will occur.
MSB OPTION BYTE
Bits 15:11 = Reserved, must be always cleared.
Bit 10 = Reserved, must be always set.
Bit 9 = EXTCNTL External STOP MODE control.
0: EXTCNTL mode not available. STOP mode is
1: EXTCNTL mode available. STOP mode is avail-
Bit 8 = LVD Low Voltage Detector on/off .
This option bit enable or disable the Low Voltage
Detector (LVD) feature.
Default
Value
not available with the watchdog active.
able with the watchdog active by setting NMI pin
to one.
15
X
Section
X
10.4, the option byte must be
Reserved
X
MSB OPTION BYTE
X
X
93). It is there-
X
Section
EXT
CTL
X
LVD
X
8
0: Low Voltage Detector disabled
1: Low Voltage Detector enabled.
LSB OPTION BYTE
Bit 7 = PROTECT Readout Protection.
This option bit enables or disables external access
to the internal program memory.
0: Program memory not read-out protected
1: Program memory read-out protected
Bit 6 = OSC Oscillator selection .
This option bit selects the main oscillator type.
0: Quartz crystal, ceramic resonator or external
1: RC network
Bit 5 = Reserved, must be always cleared.
Bit 4 = Reserved, must be always set.
Bit 3 = NMI PULL NMI Pull-Up on/off.
This option bit enables or disables the internal pull-
up on the NMI pin.
0: Pull-up disabled
1: Pull-up enabled
Bit 2 = Reserved, must be always set.
Bit 1 = WDACT Hardware or software watchdog.
This option bit selects the watchdog type.
0: Software (watchdog to be enabled by software)
1: Hardware (watchdog always enabled)
Bit 0 = OSGEN Oscillator Safeguard on/off.
This option bit enables or disables the oscillator
Safeguard (OSG) feature.
0: Oscillator Safeguard disabled
1: Oscillator Safeguard enabled
TECT
PRO-
clock
X
7
OSC Res. Res.
X
X
ST6200C/ST6201C/ST6203C
LSB OPTION BYTE
X
PULL
NMI
X
Res.
X
ACT
WD
X
15/100
OSG
EN
0
X
1