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P912XDP512F0MPVR 数据表(PDF) 291 Page - Freescale Semiconductor, Inc |
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P912XDP512F0MPVR 数据表(HTML) 291 Page - Freescale Semiconductor, Inc |
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291 / 1348 page  Chapter 6 XGATE (S12XGATEV2) MC9S12XDP512 Data Sheet, Rev. 2.21 Freescale Semiconductor 291 6.9 Initialization and Application Information 6.9.1 Initialization The recommended initialization of the XGATE is as follows: 1. Clear the XGE bit to suppress any incoming service requests. 2. Make sure that no thread is running on the XGATE. This can be done in several ways: a) Poll the XGCHID register until it reads $00. Also poll XGDBG and XGSWEIF to make sure that the XGATE has not been stopped. b) Enter Debug Mode by setting the XGDBG bit. Clear the XGCHID register. Clear the XGDBG bit. The recommended method is a). 3. Set the XGVBR register to the lowest address of the XGATE vector space. 4. Clear all Channel ID flags. 5. Copy XGATE vectors and code into the RAM. 6. Initialize the S12X_INT module. 7. Enable the XGATE by setting the XGE bit. The following code example implements the XGATE initialization sequence. 6.9.2 Code Example (Transmit "Hello World!" on SCI) CPU S12X ;########################################### ;# SYMBOLS # ;########################################### SCI_REGS EQU $00C8 ;SCI register space SCIBDH EQU SCI_REGS+$00 ;SCI Baud Rate Register SCIBDL EQU SCI_REGS+$00 ;SCI Baud Rate Register SCICR2 EQU SCI_REGS+$03 ;SCI Control Register 2 SCISR1 EQU SCI_REGS+$04 ;SCI Status Register 1 SCIDRL EQU SCI_REGS+$07 ;SCI Control Register 2 TIE EQU $80 ;TIE bit mask TE EQU $08 ;TE bit mask RE EQU $04 ;RE bit mask SCI_VEC EQU $D6 ;SCI vector number INT_REGS EQU $0120 ;S12X_INT register space INT_CFADDR EQU INT_REGS+$07 ;Interrupt Configuration Address Register INT_CFDATA EQU INT_REGS+$08 ;Interrupt Configuration Data Registers RQST EQU $80 ;RQST bit mask XGATE_REGS EQU $0380 ;XGATE register space XGMCTL EQU XGATE_REGS+$00 ;XGATE Module Control Register XGMCTL_CLEAR EQU $FA02 ;Clear all XGMCTL bits XGMCTL_ENABLE EQU $8282 ;Enable XGATE XGCHID EQU XGATE_REGS+$02 ;XGATE Channel ID Register XGVBR EQU XGATE_REGS+$06 ;XGATE ISP Select Register XGIF EQU XGATE_REGS+$08 ;XGATE Interrupt Flag Vector |
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