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UPD72042 Datasheet(PDF) 53 Page - NEC |
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UPD72042 Datasheet(HTML) 53 Page - NEC |
53 / 92 page µPD72042 53 Data Sheet S14870EJ1V0DS00 Table 4-9 indicates the SLRC return code issued in broadcast reception when an optional function is set in the CMR register with DERC = 1. Table 4-9 SLRC Return Code in Broadcast Reception When the Optional Function Is Set (DERC = 1) SLRC Description 1100 1. Meaning: Broadcast reception error 2. Occurrence condition: This return code is issued if RBF is not ready for receptionNote when the control field is received. In this case, the master address in the communication frame is set as a broadcast address in DAR2 and DAR1. 3. Microcomputer processing: A broadcast address can be read from DAR1 and DAR2. However, the data of DAR1 and DAR2 is updated each time a broadcast reception error occurs. So, ensure that data is read from DAR1 and DAR2 within the interval indicated below. • Read time: Approx. 5420 µs (mode 0) Approx. 1490 µs (mode 1) Note RBF is ready for reception according to the optional function setting in CMR, as described below. (i) When MFC = 0 The SLRE flag of the FLG register is 1 (slave reception and broadcast reception only); and RBF is empty. (ii) When MFC = 1 The SLRE flag of the FLG register is 1 (slave reception and broadcast reception only); and RBF has at least 4 bytes of free space. When RBF is ready for reception, bit 1 of slave status transmitted from the master unit with control bits 0000 or 0110 is set to 0. |
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