Difference between revisions of "84PCE:Ports:E000"
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(Added divisor latch) |
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| − | [[Category:84PCE:Ports:By_Address|E000 - | + | [[Category:84PCE:Ports:By_Address|E000 - ARM Coprocessor]] [[Category:84PCE:Ports:By_Name|ARM Coprocessor]] |
== Synopsis == | == Synopsis == | ||
'''Port Number:''' E000-EFFF | '''Port Number:''' E000-EFFF | ||
| Line 5: | Line 5: | ||
'''Memory-mapped Address:''' F90000 | '''Memory-mapped Address:''' F90000 | ||
| − | '''Function:''' | + | '''Function:''' ARM Coprocessor |
| − | + | ||
| − | + | ||
| + | This appears to be an FTUART010 (which is 16550A-compatible), & is connected to the ARM coprocessor on Python Edition. The 16550 register layout (see [https://www.lammertbies.nl/comm/info/serial-uart], for example) works after multiplying its offsets by 4. | ||
{|- | {|- | ||
|<u>Port</u> | |<u>Port</u> | ||
| − | |<u> | + | |<u>Direction</u> |
| − | + | ||
|<u>Information</u> | |<u>Information</u> | ||
| + | |- | ||
| + | |E000 | ||
| + | |Read | ||
| + | Write | ||
| + | |||
| + | Read Write | ||
| + | |Receive Holding Register (when bit 7 of E00C is 0) | ||
| + | Transmit Holding Register (when bit 7 of E00C is 0) | ||
| + | |||
| + | Divisor Latch LSB (when bit 7 of E00C is 1) | ||
| + | |- | ||
| + | |E004 | ||
| + | |Read Write | ||
| + | Read Write | ||
| + | |Interrupt Enable Register (when bit 7 of E00C is 0) | ||
| + | Divisor Latch MSB (when bit 7 of E00C is 1) | ||
| + | |- | ||
| + | |E008 | ||
| + | |Read | ||
| + | Write | ||
| + | |Interupt Status Register | ||
| + | FIFO Control Register | ||
| + | |- | ||
| + | |E00C | ||
| + | |Read Write | ||
| + | |Line Control Register | ||
| + | |- | ||
| + | |E010 | ||
| + | |Read Write | ||
| + | |Modem Control Register | ||
| + | |- | ||
| + | |E014 | ||
| + | |Read | ||
| + | |Line Status Register | ||
| + | |- | ||
| + | |E018 | ||
| + | |Read | ||
| + | |Modem Status Register | ||
| + | |- | ||
| + | |E01C | ||
| + | |Read Write | ||
| + | |Scratchpad Register | ||
| + | |- | ||
| + | |E068 | ||
| + | |Read | ||
| + | |01? (not from 16550) | ||
| + | |- | ||
| + | |E06C | ||
| + | |Read | ||
| + | |01? (not from 16550) | ||
| + | |- | ||
| + | |E070 | ||
| + | |Read | ||
| + | |10? (not from 16550) | ||
|- | |- | ||
|} | |} | ||
Latest revision as of 12:59, 6 May 2021
Synopsis
Port Number: E000-EFFF
Memory-mapped Address: F90000
Function: ARM Coprocessor
This appears to be an FTUART010 (which is 16550A-compatible), & is connected to the ARM coprocessor on Python Edition. The 16550 register layout (see [1], for example) works after multiplying its offsets by 4.
| Port | Direction | Information |
| E000 | Read
Write Read Write |
Receive Holding Register (when bit 7 of E00C is 0)
Transmit Holding Register (when bit 7 of E00C is 0) Divisor Latch LSB (when bit 7 of E00C is 1) |
| E004 | Read Write
Read Write |
Interrupt Enable Register (when bit 7 of E00C is 0)
Divisor Latch MSB (when bit 7 of E00C is 1) |
| E008 | Read
Write |
Interupt Status Register
FIFO Control Register |
| E00C | Read Write | Line Control Register |
| E010 | Read Write | Modem Control Register |
| E014 | Read | Line Status Register |
| E018 | Read | Modem Status Register |
| E01C | Read Write | Scratchpad Register |
| E068 | Read | 01? (not from 16550) |
| E06C | Read | 01? (not from 16550) |
| E070 | Read | 10? (not from 16550) |
