IMB=IMB_0, VPS=VPS_0
Error and Status 2 Register
| IMB | If ESR2[VPS] is asserted, this bit indicates whether there is any inactive Mailbox (CODE field is either 0b1000 or 0b0000) 0 (IMB_0): If ESR2[VPS] is asserted, the ESR2[LPTM] is not an inactive Mailbox. 1 (IMB_1): If ESR2[VPS] is asserted, there is at least one inactive Mailbox. LPTM content is the number of the first one. |
| VPS | This bit indicates whether IMB and LPTM contents are currently valid or not 0 (VPS_0): Contents of IMB and LPTM are invalid 1 (VPS_1): Contents of IMB and LPTM are valid |
| LPTM | If ESR2[VPS] is asserted, his 7-bit field indicates the lowest number inactive Mailbox (refer to IMB bit description) |