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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89LP428 датащи(PDF) 121 Page - ATMEL Corporation |
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AT89LP428 датащи(HTML) 121 Page - ATMEL Corporation |
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121 / 149 page  121 3654A–MICRO–8/09 AT89LP428/828 23.7 User Configuration Fuses The AT89LP428/828 includes 11 user fuses for configuration of the device. Each fuse is accessed at a separate address in the User Fuse Row as listed in Table 23-6. Fuses are cleared by programming 00H to their locations. Programming FFH to a fuse location will cause that fuse to maintain its previous state. To set a fuse (set to FFH), the fuse row must be erased and then reprogrammed using the Fuse Write with Auto-erase command. The default state for all fuses is FFH. Notes: 1. The default state for all fuses is FFH. 2. Changes to these fuses will only take effect after a device POR. 3. Changes to these fuses will only take effect after the ISP session terminates by bringing RST high. Table 23-6. User Configuration Fuse Definitions Address Fuse Name Description 00 - 01H Clock Source – CS [0:1](2) Selects source for the system clock: CS1CS0 Selected Source 00H 00H High Speed Crystal Oscillator (XTAL) 00H FFH Low Speed Crystal Oscillator (XTAL) FFH 00H External Clock on XTAL1 (XCLK) FFH FFH Internal RC Oscillator (IRC) 02 - 03H Start-up Time – SUT [0:1] Selects time-out delay for the POR/BOD/PWD wake-up period: SUT1 SUT0 Selected Time-out 00H 00H 1 ms (XTAL); 16 µs (XCLK/IRC) 00H FFH 2 ms (XTAL); 512 µs (XCLK/IRC) FFH 00H 4 ms (XTAL); 1 ms (XCLK/IRC) FFH FFH 16 ms (XTAL); 4 ms (XCLK/IRC) 04H Reset Pin Enable(3) FFH: RST pin functions as reset 00H: RST pin functions as general-purpose I/O 05H Brown-out Detector Enable FFH: Brown-out Detector Enabled 00H: Brown-out Detector Disabled 06H On-chip Debug Enable FFH: On-chip Debug Disabled 00H: On-chip Debug Enabled 07H ISP Enable(3) FFH: In-System Programming Enabled 00H: In-System Programming Disabled (Enabled at POR only) 08H User Signature Programming FFH: Programming of User Signature Disabled 00H: Programming of User Signature Enabled 09H Tristate Ports FFH: I/O Ports start in input-only mode (tristated) after reset 00H: I/O Ports start in quasi-bidirectional mode after reset 0AH OCD Interface Select FFH: Fast Two-wire Interface 00H: Do not use 0BH In-Application Programming FFH: In-Application Programming Disabled 00H: In-Application Programming Enabled |
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