eZ80F91 ASSP
Product Specification
xv
List of Figures
Figure 1. eZ80F91 ASSP Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 2. 144-Pin LQFP Configuration of the eZ80F91 . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Power-On Reset Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 4. Voltage Brown-Out Reset Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 5. GPIO Port Pin Block Diagram for Input and Interrupt Modes . . . . . . . . . . 47
Figure 6. GPIO Port Pin Block Diagram for Output and Input/Output Mode . . . . . . 47
Figure 7. Example: Memory Chip Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 8. Wait Input Sampling Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 9. Example: Wait State Read Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Figure 10. Example: Z80 Bus Mode Read Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Figure 11. Example: Z80 Bus Mode Write Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 12. Intel Bus Mode Signal and Pin Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Figure 13. Example: Intel Bus Mode Read Timing: Separate Address and Data Buses 74
Figure 14. Example: Intel Bus Mode Write Timing: Separate Address
and Data Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Figure 15. Example: Intel Bus Mode Read Timing: Multiplexed Address
and Data Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Figure 16. Example: Intel Bus Mode Write Timing: Multiplexed Address
and Data Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Figure 17. Motorola Bus Mode Signal and Pin Mapping . . . . . . . . . . . . . . . . . . . . . . . 79
Figure 18. Example: Motorola Bus Mode Read Timing . . . . . . . . . . . . . . . . . . . . . . . . 81
Figure 19. Example: Motorola Bus Mode Write Timing . . . . . . . . . . . . . . . . . . . . . . . 82
Figure 20. Memory Interface Bus Operation During CPU Bus Cycles,
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Figure 21. Memory Interface Bus Operation During Bus Acknowledge Cycles . . . . . 89
Figure 22. Example: eZ80F91 On-Chip RAM Memory Addressing . . . . . . . . . . . . . . 90
Figure 23. eZ80F91 Flash Memory Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Figure 24. Flash Memory Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Figure 25. Watchdog Timer Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Figure 26. Programmable Reload Timer Block Diagram . . . . . . . . . . . . . . . . . . . . . . 117
Figure 27. Example: PRT Single Pass Mode Operation . . . . . . . . . . . . . . . . . . . . . . . 119
Figure 28. Example: PRT Continuous Mode Operation . . . . . . . . . . . . . . . . . . . . . . . 120
Figure 29. Example: PRT Timer Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 121
PS027004-0613
P R E L I M I N A R Y
List of Figures
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