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BR34E02NUX-WE2 Datasheet(PDF) 8 Page - Rohm |
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BR34E02NUX-WE2 Datasheet(HTML) 8 Page - Rohm |
8 / 20 page 8/19 ・ The last bit of the stream (R/W…READ/WRITE) determines the operation to be performed. R/W=0 ・・・・ WRITE (including word address input of Random Read) R/W=1 ・・・・ READ Slave Address Set Pin Device Type Device Address Read Write Mode Access Area A2 A1 A0 1010 A2 A1 A0 R/W 2kbit Access to Memory A2 A1 A0 A2 A1 A0 R/W Access to Permanent Set Write Protect Memory GND GND VHV 0 0 1 R/W Access to Set Write Protect Memroy GND Vcc VHV 0110 0 1 1 R/W Access to Clear Write Protect MEmory ○ WRITE PROTECT PIN(WP) When WP pin set to Vcc (H level), write protect is set for 256 words (all address). When WP pin set to GND (L level), it is enable to write 256 words (all address). If permanent protection is done by Write Protect command, lower half area (00~7Fh address) is inhibited writing regardless of WP pin state. WP pin has a Pull-Down resistor. Please be left unconnected or connect to GND when WP feature is not in use. ○ Confirm Write Protect Resistor by ACK According to state of Write Protect Resistor, ACK is as follows. State of Write Protect Registor WP Input Input Command ACK Address ACK Data ACK Write Cycle(tWR) PSWP, SWP, CWP No ACK - No ACK No ACK No In case, protect by PSWP - Page or Byte Write (00~7Fh) ACK WA7~WA0 ACK D7~D0 No ACK No SWP No ACK - No ACK - No ACK No CWP ACK - ACK - ACK Yes PSWP ACK - ACK - ACK Yes 0 Page or Byte Write (00~7Fh) ACK WA7~WA0 ACK D7~D0 No ACK No SWP No ACK - No ACK - No ACK No CSP ACK - ACK - No ACK No PSWP ACK - ACK - No ACK No In case, protect by SWP 1 Page or Byte Write ACK WA7~WA0 ACK D7~D0 No ACK No PSWP, SWP, CWP ACK - ACK - ACK Yes 0 Page or Byte Write ACK WA7~WA0 ACK D7~D0 ACK Yes PSWP, SWP, CWP ACK - ACK - No ACK No In case, Not protect 1 Page or Byte Write ACK WA7~WA0 ACK D7~D0 No ACK No - is Don’t Care State of Write Protect Registor Command ACK Address ACK Data ACK In case, protect by PSWP PSWP, SWP, CWP No ACK - No ACK - No ACK SWP No ACK - No ACK - No ACK CWP ACK - No ACK - No ACK In case, protect by SWP PSWP ACK - No ACK - No ACK In case, Not protect PSWP, SWP, CWP ACK - No ACK - No ACK |
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