C8051F340/1/2/3/4/5/6/7
4
Rev. 0.5
9.3. Interrupt Handler ............................................................................................... 87
9.3.1. MCU Interrupt Sources and Vectors ........................................................ 87
9.3.2. External Interrupts .................................................................................... 87
9.3.3. Interrupt Priorities ..................................................................................... 88
9.3.4. Interrupt Latency ...................................................................................... 88
9.3.5. Interrupt Register Descriptions................................................................. 89
9.4. Power Management Modes .............................................................................. 96
9.4.1. Idle Mode.................................................................................................. 96
9.4.2. Stop Mode ................................................................................................ 96
10. Prefetch Engine ...................................................................................................... 99
11. Reset Sources....................................................................................................... 101
11.1.Power-On Reset ............................................................................................. 102
11.2.Power-Fail Reset / VDD Monitor .................................................................... 103
11.3.External Reset ................................................................................................ 104
11.4.Missing Clock Detector Reset ........................................................................ 104
11.5.Comparator0 Reset ........................................................................................ 104
11.6.PCA Watchdog Timer Reset .......................................................................... 104
11.7.Flash Error Reset ........................................................................................... 104
11.8.Software Reset ............................................................................................... 105
11.9.USB Reset...................................................................................................... 105
12. Flash Memory ....................................................................................................... 109
12.1.Programming The Flash Memory ................................................................... 109
12.1.1.Flash Lock and Key Functions ............................................................... 109
12.1.2.Flash Erase Procedure .......................................................................... 109
12.1.3.Flash Write Procedure ........................................................................... 110
12.2.Non-volatile Data Storage .............................................................................. 111
12.3.Security Options ............................................................................................. 111
13. External Data Memory Interface and On-Chip XRAM........................................ 117
13.1.Accessing XRAM............................................................................................ 117
13.1.1.16-Bit MOVX Example ........................................................................... 117
13.1.2.8-Bit MOVX Example ............................................................................. 117
13.2.Accessing USB FIFO Space .......................................................................... 118
13.3.Configuring the External Memory Interface .................................................... 119
13.4.Port Configuration........................................................................................... 119
13.5.Multiplexed and Non-multiplexed Selection.................................................... 122
13.5.1.Multiplexed Configuration....................................................................... 122
13.5.2.Non-multiplexed Configuration............................................................... 123
13.6.Memory Mode Selection................................................................................. 123
13.6.1.Internal XRAM Only ............................................................................... 124
13.6.2.Split Mode without Bank Select.............................................................. 124
13.6.3.Split Mode with Bank Select................................................................... 125
13.6.4.External Only.......................................................................................... 125
13.7.Timing .......................................................................................................... 125
13.7.1.Non-multiplexed Mode ........................................................................... 127
13.7.2.Multiplexed Mode ................................................................................... 130
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