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ST2205U bảng dữ liệu(PDF) 9 Page - Sitronix Technology Co., Ltd. |
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ST2205U bảng dữ liệu(HTML) 9 Page - Sitronix Technology Co., Ltd. |
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9 / 32 page  ST2205U Version 1.0 8/32 6/13/2007 6 6.. IIN NT TE ER RR RU UP PT T C CO ON NT TR RO OL LL LE ER R The ST2205U supports 16 hardware interrupts as well as one software interrupt Brk. There are 17 exception vectors for these interrupts and another one for reset. All interrupts are controlled by interrupt disable flag “I” (bit2 of status register P). Hardware interrupts are further controlled by interrupt enable register IENA . Setting bits of IENA enables respective interrupts. The interrupt controller owns one priority arbitrator. When more than one interrupts happen at the same time, the one with lower priority number will be executed first. Refer to TABLE 6-1 for priorities of interrupts. Once an interrupt event was enabled and then happens, the CPU wakes up (if in either wait mode), and associated bit of interrupt request register (IREQ) will be set. If “I” flag is cleared, the related vector will be fetched and then the interrupt service routine (ISR) will be executed. Interrupt request flag can be cleared by two methods. One is to write “0” to IREQ, the other is to initiate related interrupt service routine. Hardware will automatically clear the Interrupt request flag. All interrupt vectors are listed in TABLE 6-1. TABLE 6-1 Interrupt Vectors Name Signal Source Vector Address Priority Description BRK Internal $7FFF,$7FFE 1 Software BRK operation vector RESET External $7FFD,$7FFC 0 Reset vector - - $7FFB,$7FFA - Reserved INTX External $7FF9,$7FF8 9 PE0/1/2 edge interrupt T0 Internal/External $7FF7,$7FF6 10 Timer0 interrupt T1 Internal $7FF5,$7FF4 11 Timer1 interrupt T2 Internal/External $7FF3,$7FF2 12 Timer2 interrupt T3 Internal $7FF1,$7FF0 13 Timer3 interrupt PT External $7FEF,$7FEE 14 Port-A transition interrupt BT Internal $7FED,$7FEC 15 Base Timer interrupt LCD Internal $7FEB,$7FEA 16 LCD buffer interrupt STX External $7FE9,$7FE8 1 SPI transmit buffer empty interrupt SRX External $7FE7,$7FE6 2 SPI receive buffer ready interrupt UTX External $7FE5,$7FE4 3 UART transmitter interrupt URX External $7FE3,$7FE2 4 UART receiver interrupt USB External $7FE1,$7FE0 5 USB interrupt Reserved $7FDF,$7FDE 6 PCM Internal $7FDD,$7FDC 7 PCM interrupt RTC Internal $7FDB,$7FDA 8 RTC interrupt |
Số phần tương tự - ST2205U |
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Mô tả tương tự - ST2205U |
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