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SCS152 Datasheet(PDF) 7 Page - Microchip Technology |
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SCS152 Datasheet(HTML) 7 Page - Microchip Technology |
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7 / 16 page  SCS152 © 1997 Microchip Technology Inc. Preliminary DS40150B-page 7 3.3 RDBIT/PUTBIT The RDBIT command increments the internal address counter on the leading edge of the SCK pulse and reads the resulting bit in EEPROM. This SDIO line is updated on the falling edge of the SCK pulse. If the new address is in the UKEY0 area, the SDIO line will be tri-stated immediately in preparation of transport code entry, even if the device is in user mode. Figure 3-2 shows two consecutive RDBIT commands. The PUTBIT command mirrors a RDBIT command, but data is transmitted to the chip instead of transmitting data from the chip. It also increments the internal address counter. PUTBIT is used to enter the transport code in issuer mode and the challenge bits, during signature computation. Figure 3-3 shows data entry, typically during transport code entry. FIGURE 3-2: RDBIT FIGURE 3-3: DATA ENTRY (TRANSPORT CODE DETAIL) SCI SCK SDIO TH TL IOMAP(n) IOMAP(n-1) TD2 TH SCI SCK SDIO TH Tl IOMAP(147) TD3 TC TC(0) TC(1) TH |
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