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ST6209CB1/XXX

8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, OSCILLATOR SAFEGUARD, SAFE RESET AND 20 PINS

STMicroelectronics 

ST62T08C/T09C ST62T10C/T20C/E20C

1.4 PROGRAMMING MODES

1.4.1 Option Bytes

The two Option Bytes allow configuration capabili-

ty to the MCUs. Option byte’s content is automati-

cally read, and the selected options enabled, when

the chip reset is activated.

It can only be accessed during the programming

mode. This access is made either automatically

(copy from a master device) or by selecting the

OPTION BYTE PROGRAMMING mode of the pro-

grammer.

The option bytes are located in a non-user map.

No address has to be specified.

EPROM Code Option Byte (LSB)

7

PRO-

TECT

OSCIL

-

0

-

NMI

PULL

TIM

PULL

WDACT

OS-

GEN

EPROM Code Option Byte (MSB)

15

8

-

-

-

-

-

-

EXTC-

NTL

LVD

D15-D10. Reserved. Must be cleared

EXTCNTL. External STOP MODE control.. When

EXTCNTL is high, STOP mode is available with

watchdog active by setting NMI pin to one.. When

EXTCNTL is low, STOP mode is not available with

the watchdog active.

LVD. LVD RESET enable.When this bit is set, safe

RESET is performed by MCU when the supply

voltage is too low. When this bit is cleared, only

power-on reset or external RESET are active.

PROTECT. Readout Protection. This bit allows the

protection of the software contents against piracy.

When the bit PROTECT is set high, readout of the

OTP contents is prevented by hardware.. When

this bit is low, the user program can be read.

OSCIL. Oscillator selection. When this bit is low,

the oscillator must be controlled by a quartz crys-

tal, a ceramic resonator or an external frequency.

When it is high, the oscillator must be controlled by

an RC network, with only the resistor having to be

externally provided.

D5. Reserved. Must be cleared to zero.

D4. Reserved. Must be set to one.

NMI PULL. NMI Pull-Up. This bit must be set high

to configure the NMI pin with a pull-up resistor.

When it is low, no pull-up is provided.

TIM PULL.TIM Pull-Up. This bit must be set high

to configure the TIMER pin with a pull-up resistor.

When it is low, no pull-up is provided.

WDACT. This bit controls the watchdog activation.

When it is high, hardware activation is selected.

The software activation is selected when WDACT

is low.

OSGEN. Oscillator Safe Guard. This bit must be

set high to enable the Oscillator Safe Guard.

When this bit is low, the OSG is disabled.

The Option byte is written during programming ei-

ther by using the PC menu (PC driven Mode) or

automatically (stand-alone mode)

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