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HD64F2149YV Folha de dados(PDF) 617 Page - Renesas Technology Corp |
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HD64F2149YV Folha de dados(HTML) 617 Page - Renesas Technology Corp |
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617 / 1075 page ![]() Section 18A Host Interface X-Bus Interface (XBS) Rev. 3.00 Jan 18, 2006 page 589 of 1044 REJ09B0280-0300 HICR2 Bit 2 HICR2 Bit 1 HICR Bit 2 HICR Bit 1 IBFIE4 IBFIE3 IBFIE2 IBFIE1 Description —— — 0 Input data register (IDR1) reception completed interrupt request disabled (Initial value) —— — 1 Input data register (IDR1) reception completed interrupt request enabled —— 0 — Input data register (IDR2) reception completed interrupt request disabled (Initial value) —— 1 — Input data register (IDR2) reception completed interrupt request enabled — 0 —— Input data register (IDR3) reception completed interrupt request disabled (Initial value) — 1 —— Input data register (IDR3) reception completed interrupt request enabled 0 —— — Input data register (IDR4) reception completed interrupt request disabled (Initial value) 1 —— — Input data register (IDR4) reception completed interrupt request enabled HICR Bit 0—Fast A20 Gate Function Enable (FGA20E): Enables or disables the fast A20 gate function. When the fast A20 gate is disabled, the normal A20 gate can be implemented byte firmware operation of the P81 output. When the host interface (HIF:XBS) fast A20 gate function is enabled, the DDR bit for P81 must be set to 1. Therefore, the state of the P81/GA20 pin cannot be monitored by reading the DR bit for P81. A fast A20 gate function is also provided in the HIF:LPC. The state of the P81/GA20 pin can be monitored by reading the HIF:LPC’s GA20 bit. HICR Bit 0 P8DDR Bit 1 FGA20E P81DDR Description 0 0 HIF:XBS fast A20 gate function disabled (Initial value) 1 HIF:XBS fast A20 gate function disabled 1 0 Setting prohibited 1 HIF:XBS fast A20 gate function enabled |
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