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SIO1007 数据表(PDF) 77 Page - Microchip Technology |
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SIO1007 数据表(HTML) 77 Page - Microchip Technology |
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77 / 108 page  2005 - 2015 Microchip Technology Inc. DS00002020A-page 77 SIO1007 18.4.43 CR2C CR2C can only be accessed in the configuration state and after the CSR has been initialized to 2CH. Bits D[3:0] of this register are used to select the DMA for the SCE (FIR). Bits D[7:4] are Reserved. Reserved bits cannot be written and return 0 when read. Any unselected DMA Request output (DRQ) is in tristate. 18.4.44 CR2D CR2D can only be accessed in the configuration state and after the CSR has been initialized to 2DH. CR2D is used to set the IR Half Duplex Turnaround Delay Time for the IR port. This value is 0 to 25.5msec in 100µsec increments. The IRCC v2.0 block includes an 8-bit IR Half Duplex Time-out register in SCE Register Block 5, Address 1 that interacts with configuration register CR2D. These two registers behave like the other IRCC Legacy controls where either source uniformly updates the value of both registers when either register is explicitly written using IOW or following a device- level POR. IRCC software resets do not affect these registers. The IR Half Duplex Time-out is programmable from 0 to 25.5mS in 100 S increments, as follows: IR HALF DUPLEX TIME-OUT = (CR2D) x 100 S 18.4.45 CR2E CR2E can only be accessed in the configuration state and after the CSR has been initialized to 2EH. CR2E is directly connected to SCE Register Block Three, Address 0x05 in the IRCC v2.0 block. TABLE 18-37: CR2C SCE (FIR) DMA Select Register Type: R/W Default: 0X0F ON VCC POR BIT NO. BIT NAME DESCRIPTION 3:0 DMA Select BIT3 BIT2 BIT1 BIT0 DMA SELECTED 0 0 0 0 RESERVED 00 01 DMA1 00 10 DMA2 00 11 DMA3 0 1 0 0 RESERVED . . . . . . . . . . 1 1 1 0 RESERVED 11 11 NONE 7:4 Reserved Read Only. A read returns 0. TABLE 18-38: CR2D IR Half Duplex Timeout Type: R/W Default: 0X03 ON VCC POR BIT NO. BIT NAME DESCRIPTION 0-7 IR Half Duplex Time Out These bits are used to set the IR Half Duplex Turnaround Delay Time for the IR port. This value is 0 to 25.5msec in 100µsec increments. TABLE 18-39: CR2E Software Select A Type: R/W Default: 0X00 ON VCC POR BIT NO. BIT NAME DESCRIPTION 0-7 Software Select A These bits are directly connected to SCE Register Block Three, Address 0x05 in the IRCC v2.0 block. |
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