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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCA9539APW датащи(PDF) 6 Page - NXP Semiconductors |
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PCA9539APW датащи(HTML) 6 Page - NXP Semiconductors |
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6 / 39 page  PCA9539A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 1 — 26 September 2012 6 of 39 NXP Semiconductors PCA9539A Low voltage 16-bit I2C-bus I/O port with interrupt and reset 6.2 Registers 6.2.1 Pointer register and command byte Following the successful acknowledgement of the address byte, the bus master sends a command byte, which is stored in the Pointer register in the PCA9539A. The lower four bits of this data byte state the operation (read or write) and the internal registers (Input, Output, Polarity Inversion, or Configuration) that will be affected. This register is write only. [1] Undefined. 6.2.2 Input port register pair (00h, 01h) The Input port registers (registers 0 and 1) reflect the incoming logic levels of the pins, regardless of whether the pin is defined as an input or an output by the Configuration register. The Input port registers are read only; writes to these registers have no effect. The default value ‘X’ is determined by the externally applied logic level. An Input port register read operation is performed as described in Section 7.2 “Reading the port registers”. Fig 5. Pointer register bits 002aaf540 B7 B6 B5 B4 B3 B2 B1 B0 Table 4. Command byte Pointer register bits Command byte (hexadecimal) Register Protocol Power-up default B7 B6 B5 B4 B3 B2 B1 B0 0 0 0 0 0 0 0 0 00h Input port 0 read byte xxxx xxxx[1] 0 0 0 0 0 0 0 1 01h Input port 1 read byte xxxx xxxx 0 0 0 0 0 0 1 0 02h Output port 0 read/write byte 1111 1111 0 0 0 0 0 0 1 1 03h Output port 1 read/write byte 1111 1111 0 0 0 0 0 1 0 0 04h Polarity Inversion port 0 read/write byte 0000 0000 0 0 0 0 0 1 0 1 05h Polarity Inversion port 1 read/write byte 0000 0000 0 0 0 0 0 1 1 0 06h Configuration port 0 read/write byte 1111 1111 0 0 0 0 0 1 1 1 07h Configuration port 1 read/write byte 1111 1111 Table 5. Input port 0 register (address 00h) Bit 7 6 5 4 3 2 1 0 Symbol I0.7 I0.6 I0.5 I0.4 I0.3 I0.2 I0.1 I0.0 Default XX XX XX XX Table 6. Input port 1 register (address 01h) Bit 7 6 5 4 3 2 1 0 Symbol I1.7 I1.6 I1.5 I1.4 I1.3 I1.2 I1.1 I1.0 Default XX XX XX XX |
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