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L99PM72GXP 数据表(PDF) 80 Page - STMicroelectronics |
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L99PM72GXP 数据表(HTML) 80 Page - STMicroelectronics |
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80 / 129 page ![]() ST SPI L99PM72GXP 80/129 DocID024767 Rev 4 6.1.5 Address mapping The RAM memory area consists of 16 bit registers. For the device information (ROM memory area) the eight most significant bits of the memory cell are used. The remaining 8 are zero. All unused RAM and ROM addresses are read as ‘0’. Note: The register definition for RAM address 00H is unused. A register value of all 0 must cause the device to enter a Fail-Safe state (interpreted as ‘SDI stuck to GND’ failure). Note: ROM address 3FH is unused. An attempt to access this address must be recognized as a communication error (‘SDI stuck to VCC’ failure) and must cause the device to enter a Fail-Safe state. 6.1.6 Write operation The write operation starts with a Command Byte followed by 2, data bytes. The number of data bytes is specified in the <SPI-frame-ID>. Write command format Table 48. Address mapping RAM Address Description Access ROM Address Description Access 3FH <Configuration> R/W 3FH Reserved N/A … … … 3EH <SPI frame ID> R 13H Status Register 3 R …Unused N/A 12H Status Register 2 R 11H Status Register 1 R …… … 06H Control Register 6 R/W 05H Control Register 5 R/W 04H Control Register 4 R/W 03H Control Register 3 R/W 03H <product code 2> R 02H Control Register 2 R/W 02H <product code 1> R 01H Control Register 1 R/W 01H <silicon version> R 00H Reserved R/W 00H <ID Header> R Table 49. Write command format: command byte MSB LSB Op Code Address 0 0 A5 A4 A3 A2 A1 A0 |
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