Difference between revisions of "84PCE:Ports:A000"
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[[Category:84PCE:Ports:By_Address|A000 - Keyboard]] [[Category:84PCE:Ports:By_Name|Keyboard]] | [[Category:84PCE:Ports:By_Address|A000 - Keyboard]] [[Category:84PCE:Ports:By_Name|Keyboard]] | ||
== Synopsis == | == Synopsis == | ||
| − | '''Port Number:''' A000- | + | '''Port Number:''' A000-A003 |
'''Memory-mapped address:''' F50000 | '''Memory-mapped address:''' F50000 | ||
| − | '''Function:''' | + | '''Function:''' Set the mode of the keypad controller |
| − | + | Bits 0-1: Scan mode | |
| + | Mode 0: Idle. | ||
| + | Mode 1: Indiscriminate key detection. Data registers are not updated, but whenever any key is pressed, interrupt bit 2 is set (and cannot be cleared until the key is released). | ||
| + | Mode 2: Single scan. The keypad is scanned once, and then the mode returns to 0. | ||
| + | Mode 3: Continuous scan. When scanning completes, it just starts over again after a delay. | ||
| + | Bits 2-15: Number of APB cycles to wait before scanning each row | ||
| + | Bits 16-31: Number of APB cycles to wait between scans | ||
Revision as of 01:28, 31 March 2015
Synopsis
Port Number: A000-A003
Memory-mapped address: F50000
Function: Set the mode of the keypad controller
Bits 0-1: Scan mode Mode 0: Idle. Mode 1: Indiscriminate key detection. Data registers are not updated, but whenever any key is pressed, interrupt bit 2 is set (and cannot be cleared until the key is released). Mode 2: Single scan. The keypad is scanned once, and then the mode returns to 0. Mode 3: Continuous scan. When scanning completes, it just starts over again after a delay. Bits 2-15: Number of APB cycles to wait before scanning each row Bits 16-31: Number of APB cycles to wait between scans
