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Table 3.53 lists the conditions under which read accesses from TMC registers return valid values. Reads at other times returns Unknown values. In the Table 3.53, X indicates that any value is permitted.
| Read accesses to TMC registers | ||||||
|---|---|---|---|---|---|---|
| Register | TraceCaptEn | TMCReady | MODE | SG | ITCTRL | Remarks |
| RSZ[a] | X | X | X | X | X | - |
| STS-MemErr | X | X | X | X | 0 | - |
| STS-Empty | 1 | X | X | X | 0 | - |
| STS-FtEmpty | X | X | X | X | 0 | - |
| STS-TMCReady | X | X | X | X | 0 | - |
| STS-Triggered | 1 | X | CB | X | 0 | - |
| 0 | X | X | X | 0 | Value of this bit when trace capture stops is held. | |
| STS-Full | X | X | X | X | 0 | Value of this bit when trace capture stops is held. |
| RRD | 0 | 1 | X | X | 0 | - |
| 1 | X | SWF | X | 0 | If trace memory is empty, data
returned is 0xFFFFFFFF. | |
| 1 | 1 | CB | X | 0 | ||
| RRP | 1 | 0 | SWF | X | 0 | - |
| 1 | 1 | SWF CB | X | 0 | - | |
| 0 | X | X | X | 0 | - | |
| RWP | 1 | 0 | SWF | X | 0 | - |
| 1 | 1 | SWF CB | X | 0 | - | |
| 0 | X | X | X | 0 | - | |
| TRG | 1 | X | CB | X | 0 | The trigger counter is active only in Circular Buffer mode. |
| 0 | X | X | X | 0 | ||
| CTL | X | X | X | X | 0 | - |
| RWD | Write-only | |||||
| MODE | 1 | X | X | X | 0 | - |
| LBUFLEVEL | 1 | X | X | 0 | 0 | - |
| 0 | X | X | X | 0 | Value of this register when trace capture stops is held. | |
| CBUFLEVEL | 1 | X | X | 0 | 0 | - |
| BUFWM | X | X | X | X | X | Programmed registers can be read at any time. The return value is the value that was programmed. |
| RRPHI | 1 | 0 | SWF | X | 0 | - |
| 1 | 1 | SWF CB | X | 0 | - | |
| 0 | X | X | X | 0 | - | |
| RWPHI | 1 | 0 | SWF | X | 0 | - |
| 1 | 1 | SWF CB | X | 0 | - | |
| 0 | X | X | X | 0 | - | |
| AXICTL | X | X | X | X | X | - |
| DBALO | X | X | X | X | X | - |
| DBAHI | X | X | X | X | X | - |
| FFSR | X | X | X | X | 0 | - |
| FFCR | X | X | X | X | X | - |
| PSCR | X | X | X | X | X | - |
| ITATBMDATA0 | Write-only | |||||
| ITATBMCTR2 | X | X | X | X | 1 | - |
| ITATBMCTR1 | X | X | X | X | 1 | - |
| ITATBMCTR0 | Write-only | |||||
| ITMISCOP0 | Write-only | |||||
| ITTRFLIN | X | X | X | X | 1 | - |
| ITATBDATA0 | X | X | X | X | 1 | - |
| ITATBCTR2 | Write-only | |||||
| ITATBCTR1 | X | X | X | X | 1 | - |
| ITATBCTR0 | X | X | X | X | 1 | - |
| ITCTRL | X | X | X | X | X | - |
| CLAIMSET | X | X | X | X | X | - |
| CLAIMCLR | X | X | X | X | X | - |
| LOCKACCESS | Write-only | |||||
| LOCKSTATUS | X | X | X | X | X | - |
| AUTHSTATUS | X | X | X | X | X | - |
| DEVID | X | X | X | X | X | - |
| DEVTYPE | X | X | X | X | X | - |
| PERIPHID4 | X | X | X | X | X | - |
| PERIPHID5 | X | X | X | X | X | - |
| PERIPHID6 | X | X | X | X | X | - |
| PERIPHID7 | X | X | X | X | X | - |
| PERIPHID0 | X | X | X | X | X | - |
| PERIPHID1 | X | X | X | X | X | - |
| PERIPHID2 | X | X | X | X | X | - |
| PERIPHID3 | X | X | X | X | X | - |
| COMPID0 | X | X | X | X | X | - |
| COMPID1 | X | X | X | X | X | - |
| COMPID2 | X | X | X | X | X | - |
| COMPID3 | X | X | X | X | X | - |
[a] In ETR configuration. | ||||||