oberheimmatrix1000
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oberheimmatrix1000 [2016-07-30 05:51] – Add UART datasheet gde | oberheimmatrix1000 [2016-07-30 08:13] – [Memory Map] gde | ||
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0x1400-0x17ff UORV* { | 0x1400-0x17ff UORV* { | ||
| | ||
- | 0x1400 - $ U809 - 68850 - UART (if A9 = 0) | + | 0x1400-0x15ff |
+ | 0x1406 - Control/ | ||
+ | Control (write-only) { | ||
+ | Bit 0: Counter Divide Select 0 (CR0) | ||
+ | Bit 1: Counter Divide Select 1 (CR1) | ||
+ | Bit 2: Word Select 1 (CR2) | ||
+ | Bit 3: Word Select 2 (CR3) | ||
+ | Bit 4: Word Select 3 (CR4) | ||
+ | Bit 5: Transmit Control 1 (CR5) | ||
+ | Bit 6: Transmit Control 2 (CR6) | ||
+ | Bit 7: Receive Interrupt Enable (CR7) | ||
+ | } | ||
+ | Status (read-only) { | ||
+ | Bit 0: Receive Data Register Full (RDRF) | ||
+ | Bit 1: Transmit Data Register Empty (TDRE) | ||
+ | Bit 2: Data Carrier Detect (/DCD) active low | ||
+ | Bit 3: Clear To Send (/CTS) active low | ||
+ | Bit 4: Framing error (FE) | ||
+ | Bit 5: Receiver Overrun (OVRN) | ||
+ | Bit 6: Parity Error (PE) | ||
+ | Bit 7: Interrupt Request (IRQ) | ||
+ | } | ||
+ | } | ||
+ | 0x1407 - Transmit/ | ||
+ | } | ||
0x1600 - 82C54 Programmable Timer (if A9 = 1) | 0x1600 - 82C54 Programmable Timer (if A9 = 1) | ||
This timer is the source of /IRQ back to the 6809 | This timer is the source of /IRQ back to the 6809 | ||
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0x1c00-0x1fff WRITE ONLY | 0x1c00-0x1fff WRITE ONLY | ||
U820: { | U820: { | ||
- | 0x1c00-0x1c7f L1* | + | 0x1c00-0x1c7f L1* RA1-RA6, NOT |
- | 0x1c80-0x1cff L2* | + | 0x1c80-0x1cff L2* RB1-RB6 |
- | 0x1d00-0x1d7f L3* | + | 0x1d00-0x1d7f L3* - SYNC1/ |
0x1d80-0x1dff MISC* | 0x1d80-0x1dff MISC* | ||
$ U818 - 74LS174 - 6bit latch, address bank register { | $ U818 - 74LS174 - 6bit latch, address bank register { | ||
Line 162: | Line 186: | ||
==== 6850 UART ==== | ==== 6850 UART ==== | ||
+ | {{ : | ||
oberheimmatrix1000.txt · Last modified: 2016-09-26 20:21 by gde