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MCRF355 Scheda tecnica(PDF) 10 Page - Microchip Technology |
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MCRF355 Scheda tecnica(HTML) 10 Page - Microchip Technology |
10 / 22 page MCRF355/360 DS21287F page 10 2002 Microchip Technology Inc. 4.0 DEVICE PROGRAMMING MCRF355/360 is a reprogrammable device in Contact mode. The device has 154 bits of reprogrammable memory. It can be programmed in the following proce- dure. (A programmer, part number PG103003, is also available from Microchip). 4.1 Programming Logic Programming logic is enabled by applying power to the device and clocking the device via the CLK pad while loading the mode code via the V PRG pad (See Examples 4-1 through 4-4 for test definitions). Both the CLK and the V PRG pads have internal pull-down resistors. 4.2 Pin Configuration Connect antenna A, B and V SS pads to ground. 4.3 Pin Timing 1. Apply V DDT voltage to VDD. Leave VSS, CLK and V PRG at ground. 2. Load mode code into the V PRG pad. The VPRG is sampled at CLK low to high edge. 3. The above mode function (3.2.2) will be executed when the last bit of code is entered. 4. Power the device off (V DD = VSS) to exit Programming mode. 5. An alternative method to exit the Programming mode is to bring CLK logic “High” before V PRG to V HH (high voltage). 6. Any Programming mode can be entered after exiting the current function. 4.4 Programming Mode 4.5 Signal Timing Examples 4-1 through 4-4 show the timing sequence for programming and reading of the device. EXAMPLE 4-1: PROGRAMMING MODE 1: ERASE EE EXAMPLE 4-2: PROGRAMMING MODE 2: PROGRAM EE 1. Erase EE Code: 0111010100 2. Program EE Code: 0111010010 3. Read EE Code: 0111010110 Note: ‘0’ means logic “Low” (V IL) and ‘1’ means logic “High” (V IH). V HH V IL V IH T WC V PRG: CLK Number: CLK 1 234 56 7 8 9 10 11 Note: Erases entire array to a ‘1’ state between CLK 11 and 12. 12 V HH… V IL V IH T WC T WC Leave low to leave bit at “1” Pulse high to program bit to “0” Program bit #0 … Program bit #153 CLK Number: CLK: V PRG: 1 2 5 6 7 8 9 10 11 … 165 … Note: Pulsing VPRG to VHH for the bit programming time while holding the CLK low programs the bit to a ‘0’. |
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