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PCF7936AS3851C Datasheet(PDF) 15 Page - NXP Semiconductors |
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PCF7936AS3851C Datasheet(HTML) 15 Page - NXP Semiconductors |
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15 / 32 page  NXP Semiconductors Product Specification Security Transponder (HITAG2) PCF7936AS 2010 May 04 15 CONFIDENTIAL HALT The command HALT may be issued in AUTHORIZED state and forces the device to enter the HALT state. For data integrity reasons the 5 bit command and its complement have to be send, before the device will accept it, see Figure 10. If accepted, the command Response consist of the command itself and its complement. The 10 bit command sequence may be repeated several times, if desired, to increase the data integrity level. In the case that one of the 5 bit commands and its complement do not match, an error condition occurs that causes the device to terminate the command, to initialize the device and to enter the WAIT state. No command Response will be send by the device in this case. If the device is configured for Password mode (ENC = 0) the command sequence is transmitted in plain, while in Cipher mode (ENC = 1) the whole command sequence is transmitted ciphered. READ_PAGE The command READ_PAGE returns the content of the designated page. The page designated for reading is specified by the command bits pg2 to pg0. For data integrity reasons the 5 bit command and its complement have to be send, before the device will accept it, see Figure 11. If accepted, the command Response consists of the 32 bit content of the designated page. The MSB is send first. The 10 bit command sequence may be repeated several times, if desired, to increase the data integrity level. In the case that one of the 5 bit commands and its complement do not match, an error condition occurs that causes the device to terminate the command, to initialize the device and to enter the WAIT state. No command Response will be send by the device in this case. Subsequent commands may be issued after termination of tWAIT,Bs. Any attempt to read a page that is protected against reading, will be detected and cause an error condition, upon which the device terminates the command during tWAIT,Tr and enters the WAIT state. No Response will be send in this case. If the device is configured for Password mode (ENC = 0) the command sequence is transmitted in plain, while in Cipher mode (ENC = 1) the whole command sequence is transmitted ciphered. SEND to Transponder RECEIVED from Transponder 0 0 0 0 1 1 1 1 1 1 tWAIT,Tr 0 0 0 0 1 CM[4:0] EQ HALT 1 1 1 1 0 CM[4:0] CM[4:0] 1 1 1 1 0 CM[4:0] Figure 10. HALT timing SEND to Transponder RECEIVED from Transponder 1 1, pg2, pg1, pg0 1 1 1 1 1 tWAIT,Tr CM[4:0] EQ tWAIT,Bs READ_PAGE bit 31 ..................... bit 0 0 0, pg2, pg1, pg0 CM[4:0] Data Figure 11. READ_PAGE timing |
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