Hardware
Hardware Parallel Interface
The full 16-bit hardware parallel interface provides the fastest data communication with TFT displays. However, it is available only on 16-bit PIC microcontrollers, and even then a full 16-bit port may not always be available. In such cases, two 8-bit ports can be combined to form the lower and upper bytes of the 16-bit data bus.
For 8-bit MCUs, using two 8-bit ports is the only available option. For 16-bit MCUs, either a single 16-bit port or two 8-bit ports may be used. When two 8-bit half ports are used on a 16-bit MCU, the definition must specify whether the selected port corresponds to the lower or upper byte of the 16-bit port.
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'8b microcontroller $define TFT_COM PAR_2x8b 'Use 2x8 bit ports $define TftDataHighByte PORTB 'PORTB is the high byte of the 16b data word $define TftDataLowByte PORTD 'PORTD is the low byte of the 16b data word |
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'16b microcontroller $define TFT_COM PAR_2x8b 'Use 2x8 bit ports $define TftDataHighByte PORTC.LowByte 'The low byte of PORTB is the high byte of the 16b data word $define TftDataLowByte PORTD.HighByte 'The high byte of PORTD is the low byte of the 16b data word |
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'16b microcontroller $define TFT_COM PAR_16b 'Use one 16 bit port $define TftDataWord PORTD 'PORTD is the data word |
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