UM0225 datasheet(34/57 Pages) STMICROELECTRONICS

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3 Designing with CAPS

UM0225

33/56

Thirty-two bytes of OTP memory can be programmed one time, only, through either the JTAG

programmer or by the CPU.

Note:

These bytes can never be altered once they are programmed.

Enter the hexadecimal value in the numbered byte location. Table 2.: Reserved OTP memory

bytes shows the reserved and recommended OTP memory usage.

Table 2.

Reserved OTP memory bytes

Setting the OTP lock bit disables any further writing to OTP memory. The lock bit, itself, is also

one-time programmable. If the OTP array is unlocked, it is always possible to write to an OTP

byte location that has not been written. It is never possible to change the value of an OTP byte

location if any one bit of the byte location was previously written.

Check the OTP Bit Lock checkbox to disable writes to OTP memory.

3.7

Validating and programming the target device

After completing the design of your project, you are ready to program the firmware into your

target device.

Before programming the device, perform the following steps.

Set your default programming to use either Single device view or Multiple device view,

using the Project | Preferences menu selection shown in Figure 30.: Project preferences

dialog.

Figure 30. Project preferences dialog

Use single device view if there is only one device on your board. Use multiple device view

if multiple devices are daisy-chained. Click the radio button corresponding to the desired

view.

A JTAG chain is defined to be two or more JTAG-compliant, IEEE 1149.1 standard

devices connected together in a chain. Each device in the chain must support the four

basic JTAG signals: TDI, TDO, TCK and TMS.

The following JTAG chaining rules apply.

–

Different brands of chips must be set in “ByPass” operation and will require different

programming software.

‘Byte Number

Reserved/Recommended Usage

24-29

Ethernet MAC address

Mask identifier

Family identifier

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