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TCA6416PWT Datasheet(PDF) 9 Page - Texas Instruments |
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TCA6416PWT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 35 page Register Descriptions Power-On Reset TCA6416 www.ti.com ........................................................................................................................................ SCPS153A – DECEMBER 2007 – REVISED FEBRUARY 2009 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. They act only on read operation. Writes to these registers have no effect. The default value (X) is determined by the externally applied logic level. Before a read operation, a write transmission is sent with the command byte to indicate to the I2C device that the Input Port register will be accessed next. Registers 0 and 1 (Input Port Registers) BIT I-07 I-06 I-05 I-04 I-03 I-02 I-01 I-00 DEFAULT X X X X X X X X BIT I-17 I-16 I-15 I-14 I-13 I-12 I-11 I-10 DEFAULT X X X X X X X X The Output Port registers (registers 2 and 3) shows\ the outgoing logic levels of the pins defined as outputs by the Configuration register. Bit values in these registers have no effect on pins defined as inputs. In turn, reads from these registers reflect the value that is in the flip-flop controlling the output selection, NOT the actual pin value. Registers 2 and 3 (Output Port Registers) BIT O-07 O-06 O-05 O-04 O-03 O-02 O-01 O-00 DEFAULT 1 1 1 1 1 1 1 1 BIT O-17 O-16 O-15 O-14 O-13 O-12 O-11 O-10 DEFAULT 1 1 1 1 1 1 1 1 The Polarity Inversion registers (register 4 and 5) allow polarity inversion of pins defined as inputs by the Configuration register. If a bit in these registers is set (written with 1), the corresponding port pin's polarity is inverted. If a bit in these registers is cleared (written with a 0), the corresponding port pin's original polarity is retained. Registers 4 and 5 (Polarity Inversion Registers) BIT P-07 P-06 P-05 P-04 P-03 P-02 P-01 P-00 DEFAULT 0 0 0 0 0 0 0 0 BIT P-17 P-16 P-15 P-14 P-13 P-12 P-11 P-10 DEFAULT 0 0 0 0 0 0 0 0 The Configuration registers (registers 6 and 7) configure the direction of the I/O pins. If a bit in these registers is set to 1, the corresponding port pin is enabled as an input with a high-impedance output driver. If a bit in these registers is cleared to 0, the corresponding port pin is enabled as an output. Registers 6 and 7 (Configuration Registers) BIT C-07 C-06 C-05 C-04 C-03 C-02 C-01 C-00 DEFAULT 1 1 1 1 1 1 1 1 BIT C-17 C-16 C-15 C-14 C-13 C-12 C-11 C-10 DEFAULT 1 1 1 1 1 1 1 1 When power (from 0 V) is applied to VCCP, an internal power-on reset holds the TCA6416 in a reset condition until VCCP has reached VPOR. At that time, the reset condition is released, and the TCA6416 registers and I2C/SMBus state machine initializes to their default states. After that, VCCP must be lowered to below 0.2 V and back up to the operating voltage for a power-reset cycle. Copyright © 2007–2009, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TCA6416 |
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