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ST62T25LD3 Datasheet(PDF) 16 Page - STMicroelectronics |
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ST62T25LD3 Datasheet(HTML) 16 Page - STMicroelectronics |
16 / 105 page ST6215C ST6225C 16/105 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 Section 12.6.2 "ROM Version" on page 98). It is therefore 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 Section 11.4, the option byte must be programmed to its default value. Otherwise, an over-consumption will occur. MSB OPTION BYTE Bits 15:10 = Reserved, must be always cleared. Bit 9 = EXTCNTL External STOP MODE control. 0: EXTCNTL mode not available. STOP mode is not available with the watchdog active. 1: EXTCNTL mode available. STOP mode is avail- able with the watchdog active by setting NMI pin to one. Bit 8 = LVD Low Voltage Detector on/off. This option bit enable or disable the Low Voltage Detector (LVD) feature. 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 clock 1: RC network Bits 5:4 = Reserved, must be always cleared. 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 = TIM PULL TIMER Pull-Up on/off. This option bit enables or disables the internal pull- up on the TIMER pin. 0: Pull-up disabled 1: Pull-up enabled 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 MSB OPTION BYTE 15 8 LSB OPTION BYTE 70 Reserved EXT CTL LVD PRO- TECT OSC Res. Res. NMI PULL TIM PULL WD ACT OSG EN Default Value XXX XXXXX X X X X X X X X 1 |
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