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VR4102 Datasheet(PDF) 473 Page - NEC |
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VR4102 Datasheet(HTML) 473 Page - NEC |
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473 / 701 page  CHAPTER 24 SIU (SERIAL INTERFACE UNIT) 473 24.2.9 SIUMC (0x0C00 0004) Bit D7 D6D5 D4D3D2 D1 D0 Name Reserved Reserved Reserved MCR[4] MCR[3] MCR[2] MCR[1] MCR[0] R/W R R R R/W R/W R/W R/W R/W RTCRST 0 0 0 0 0 0 0 0 Other resets 0 0 0 0 0 0 0 0 Bit Name Function D[7..5] Reserved Write 0 when writing. 0 is returned after read. D[4] MCR[4] For diagnostic testing (local loopback) 1 : Enable use of local loopback 0 : Disable use of local loopback D[3] MCR[3] OUT2 signal (internal) specification 1 : Output the low-level signal 0 : Output the high-level signal D[2] MCR[2] OUT1 signal (internal) specification 1 : Output the low-level signal 0 : Output the high-level signal D[1] MCR[1] RTS# output control 1 : Output the low-level signal 0 : Output the high-level signal D[0] MCR[0] DTR# output control 1 : Output the low-level signal 0 : Output the high-level signal This register is used for interface control with a modem or data set (or a peripheral device that emulates a modem). The settings of bit 3 and bit 2 become valid only when bit 4 is set to 1 (enable use of local loopback). z Local Loopback The local loopback can be used to test the transmit/receive data path in the SIU. The following operation is executed when bit 4 value = 1. The transmit block’s serial output (TxD) enters the marking state (logical 1) and the serial input (RxD) to the receive block is cut off. The transmit shift register’s output is looped back to the receive shift register’s input. The four modem control inputs (DSR#, CTS#, RI (internal), and DCD#) are cut off and the four modem control outputs (DTR#, RTS#, OUT1 (internal), and OUT2 (internal)) are internally connected to the corresponding modem control inputs. The modem control output pins are forcibly set as inactive (high level). During this kind of loopback mode, transmitted data can be immediately and directly received. This function can be used to check on the transmit/receive data bus within the SIU. When in loopback mode, both transmission and receive interrupts can be used. The interrupt sources are external sources in relation to the transmit and receive blocks. Although modem control interrupts can be used, the low-order four bits of the modem control register can be used instead of the four modem control inputs as interrupt sources. As usual, each interrupt is controlled by an interrupt enable register. |
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