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78M6612-IM/F/P Datasheet(PDF) 44 Page - Teridian Semiconductor Corporation |
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78M6612-IM/F/P Datasheet(HTML) 44 Page - Teridian Semiconductor Corporation |
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44 / 111 page  78M6612 Data Sheet DS_6612_001 44 Rev. 1.2 Table 39: DIO_DIR Control Bit DIO_DIR [n] 0 1 Input DIO Pin n Function Output Additionally, if DIO6 and DIO7 are declared outputs, they can be configured as dedicated pulse outputs (WPULSE = DIO6, VARPULSE = DIO7) using DIO_PW and DIO_PV registers. In this case, DIO6 and DIO7 are under CE control. DIO4 and DIO5 can be configured to implement the EEPROM Interface. If the optical UART is not used, TX1 and RX1 can be configured as dedicated DIO pins (DIO1, DIO2, see Section 1.5.6 Optical Interface). A 3-bit configuration word, I/O RAM register, DIO_Rx (0x2009[2:0] through 0x200E[6:4]) can be used for certain pins, when configured as DIO, to individually assign an internal resource such as an interrupt or a timer control (see Table 38 for DIO pins available for this option). This way, DIO pins can be tracked even if they are configured as outputs. Tracking DIO pins configured as outputs is useful for pulse counting without external hardware. When driving LEDs, relay coils etc., the DIO pins should sink Figure 8 the current into ground (as shown in , right), not Figure 8 source it from V3P3D (as shown in , left). This is due to the resistance of the internal switch that connects V3P3D to either V3P3SYS or VBAT. When configured as inputs, the dual-function (DIO/SEG) pins should not be pulled above V3P3SYS in MISSION and above VBAT in LCD and BROWNOUT modes. Doing so will distort the LCD waveforms of the other pins. This limitation applies to any pin that can be configured as a LCD driver. The control resources selectable for the DIO pins are listed in Table 40. If more than one input is connected to the same resource, the resources are combined using a logical OR. Figure 8: Connecting an External Load to DIO Pins Not recommended 78M6612 DIO1 R V3P3D LED V3P3SYS 3.3V DGND VBAT DIO1 R V3P3D LED V3P3SYS 3.3V DGND VBAT Recommended R LED DIO1 V3P3D V3P3SYS DGND VBAT 3.3V Recommended R LED DIO1 V3P3D 78M6612 V3P3SYS DGND VBAT 3.3V |
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