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AT89C51-24PC Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT89C51-24PC Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 15 page  AT89C51 4-35 Figure 3. Programming the Flash Figure 4. Verifying the Flash P1 P2.6 P3.6 P2.0 - P2.3 A0 - A7 ADDR. OOOOH/OFFFH T SEE FLASH PROGRAMMING MODES ABLE 3-24 MHz A8 - A11 P0 +5V P2.7 PGM DATA PROG V/V IH PP V IH ALE P3.7 XTAL2 EA RST PSEN XTAL1 GND V CC AT89C51 P1 P2.6 P3.6 P2.0 - P2.3 A0 - A7 ADDR. OOOOH/0FFFH 3-24 MHz A8 - A11 P0 +5V P2.7 PGM DATA (USE 10K PULLUPS) V IH V IH ALE P3.7 XTAL2 EA RST PSEN XTAL1 GND V CC AT89C51 T SEE FLASH PROGRAMMING MODES ABLE Flash Programming and Verification Characteristics TA = 0°C to 70°C, VCC = 5.0 ± 10% Note: 1. Only used in 12-volt programming mode. Symbol Parameter Min Max Units VPP (1) Programming Enable Voltage 11.5 12.5 V IPP (1) Programming Enable Current 1.0 mA 1/tCLCL Oscillator Frequency 324 MHz tAVGL Address Setup to PROG Low 48tCLCL tGHAX Address Hold After PROG 48tCLCL tDVGL Data Setup to PROG Low 48tCLCL tGHDX Data Hold After PROG 48tCLCL tEHSH P2.7 (ENABLE) High to VPP 48tCLCL tSHGL VPP Setup to PROG Low 10 µs tGHSL (1) VPP Hold After PROG 10 µs tGLGH PROG Width 1110 µs tAVQV Address to Data Valid 48tCLCL tELQV ENABLE Low to Data Valid 48tCLCL tEHQZ Data Float After ENABLE 048tCLCL tGHBL PROG High to BUSY Low 1.0 µs tWC Byte Write Cycle Time 2.0 ms |
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