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DS2407V 数据表(PDF) 16 Page - Dallas Semiconductor |
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DS2407V 数据表(HTML) 16 Page - Dallas Semiconductor |
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16 / 31 page  DS2407 012099 16/31 available, bit 6 of the Channel Info Byte reads 1. For 1–channel versions of the DS2407, the PIO B sensed level, channel flip–flop value, and activity latch value should be ignored. Without an external supply, the sup- ply indication bit (bit 7) reads 0. As long as the voltage applied to the VCC pin is high enough to operate the device this bit will read 1. CHANNEL CONTROL BYTE 1 Figure 7a BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 Activity latch reset IM TOG IC CHS1 CHS0 CRC1 CRC0 CHANNEL CONTROL BYTE 2 Figure 7b BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 1 1 1 1 1 1 1 1 THE EFFECT OF TOGGLE MODE AND INITIAL MODE Figure 7c TOG IM CHANNELS EFFECT 0 0 one channel Write all bits to the selected channel. 0 1 one channel Read all bits from the selected channel. 1 0 one channel Write eight bits, read eight bits, write, read, etc. to/ from the selected channel. 1 1 one channel Read eight bits, write eight bits, read, write, etc. from/to the selected channel. 0 0 two channels Repeat: four times (write A, write b) 0 1 two channels Repeat: four times (read A, read B) 1 0 two channels Four times: (write A, write B), four times: (read A, read B), write, read, etc. 1 1 two channels Four times: (read A, read B), four times: (write A, write B), read, write, etc. CHANNEL INFO BYTE Figure 8 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 Supply Indication 0=no sup- ply Number of Channels 0=channel A only PIO–B Activity Latch PIO–A Activity Latch PIO–B Sensed Level PIO–A Sensed Level PIO–B Channel Flip–Flop Q PIO–A Channel Flip–Flop Q |
类似零件编号 - DS2407V |
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类似说明 - DS2407V |
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