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T89C51RD2-3CWC-M 数据表(PDF) 66 Page - ATMEL Corporation |
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T89C51RD2-3CWC-M 数据表(HTML) 66 Page - ATMEL Corporation |
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66 / 86 page  Rev. F - 15 February, 2001 66 T89C51RD2 Note 1: P3.2 is pulled low during programming to indicate RDY/BUSY. (P3.2 = 1 Ready; P3.2 = 0 Busy). Note 2: In Page Load Mode the current byte is loaded on ALE rising edge. Note 3: After a power up all external test mode to program or to erase the FLASH are locked to avoid any untimely programming or erasure. After each programming or erasure test mode, it’s advised to lock this feature (test mode PELCK). To validate the test mode mode PEULCK the following sequence has to be applied: Test Mode PEULCK with ALE = 1. Pulse on ALE (min width=25clk) with P0=55 (P0 latched on ALE rising edge) Pulse on ALE (min width=25clk) with P0=AA (P0 latched on ALE rising edge) Note 4: The highest security bit (bit 7) is used to secure the 7 lowest bit erasure. The only way to erase this bit is to erase the whole FLASH memory. Procedure to program security bits (After array programming): - program bit7 to 0, program all other bits ( 1 = erased, 0 = programmed). - test mode PGMS (din = HSB). Procedure to erase security byte: - test mode CERR: erase all array included HSB. - program hardware security byte to FF: test mode PGMS (din = FF). 8.9.3. Definition of terms Address Lines:P1.0-P1.7, P2.0-P2.5, P3.4-P3.5, respectively for A0-A15. Data Lines:P0.0-P0.7 for D0-D7 Control Signals:RST, PSEN, P2.6, P2.7, P3.2, P3.3, P3.6, P3.7. Program Signals: ALE/PROG, EA Mode Name Mode P1[7..0] P2[5..0] P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 PELCK Program or Erase Lock. Disable the Erasure or Programming access xx xx xx x 1xx PEULCK Program or Erase UnLock. Enable the Erasure or Programming access xx xx xx x 0xx PGMC Write Code Data (byte) or write Page Always precedeed by PGML A7-A0 A13-A8 1 x Note1 0 A14 A15 PGML Memory Page Load (up to 128 bytes) A7-A0 A13-A8 1 x x 0 A14 A15 PGMV Read Code Data (byte) A7-A0 A13-A8 1 x x 1 A14 A15 VSB Read Security Byte (=HSB) xx xx 1 x x 1 x x PGMS Write lock Byte (Note 4) (security byte = HSB) xx xx 1 x Note1 0 x x CERR Chip Erase User + XAF xx xx 1 x x 0 x x PGXC Write Byte or Page Extra Memory (XAF) Always precedeed by PGXL A7-A0 (0-7F) xx 1 x Note1 0 x x PGXL Memory Page Load XAF (up to 128 bytes) A7-A0 (0-7F) xx 1x x 1xx TMS Read Signature bytes 30h (Manufacturer code) 31h (Device ID #1) 60h (Device ID #2) 61h (Device ID #3) 30h 31h 60h 61h x x x x 1xx RXAF Read Extra Memory (XAF) Addr (0-7F) 00 1x x 0xx |
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