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MC9328MX21VH Datasheet(PDF) 62 Page - Motorola, Inc |
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MC9328MX21VH Datasheet(HTML) 62 Page - Motorola, Inc |
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62 / 106 page  MC9328MX21 Product Preview, Rev. 1.1 62 Freescale Semiconductor Specifications Figure 46. 1-Wire Initialization The reset pulse begins the initialization sequence and it is initiated when the RPP control register bit is set. When the presence pulse is detected, this bit will be cleared. The presence pulse is used by the bus master to determine if at least one DS2502 is connected. Software will determine if more than one DS2502 exists. The one-wire will sample for the DS2502 presence pulse. The presence pulse is latched in the one-wire control register PST. When the PST bit is set to a one, it means that a DS2502 is present; if the bit is set to a zero, then no device was found. 3.17.2 Write 0 The Write 0 function simply writes a zero bit to the DS2502. The sequence takes 117 us. The one-wire bus is held low for 100us. Figure 47. Write 0 Timing The Write 0 pulse sequence is initiated when the WR0 control bit register is set. When the write is complete, the WR0 register will be auto cleared. 3.17.3 Write 1/Read Data The Write 1 and Read timing is identical. The time slot is first driven low. According to the DS2502 documentation, the DS2502 has a delay circuit which is used to synchronize the DS2502 with the bus master (one-wire). This delay circuit is triggered by the falling edge of the data line and is used to decide when the DS2502 should sample the line. In the case of a write 1 or read 1, after a delay, a 1 will be transmitted / received. When a read 0 slot is issued, the delay circuit will hold the data line low to override the 1 generated by the bus master (one-wire). For the Write 1 or Read, the control register WR1/RD is set and auto-cleared when the sequence has been completed. After a Read, the control register RDST bit is set to the value of the read. one-wire DS2502 waits 15-60us DS2502 Tx “presence pulse” 60-240us 68us BUS Reset and Presence Pulses One-Wire samples (set PST) 512us AutoClear RPP Control Bit Set RPP 511 us 100us one-wire 17us BUS Write 0 Slot 128us AutoClear WR0 Set WR0 |
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