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Chapter 11 Memory Controller
8.Explanations of Registers
• BIT[17]: PF2I - Prefetch 32 bit (2 instructions) only
When switching on 64 bit read mode (RD64=1) then prefetch will be performed on instruction address
IA+8 (when current access is aligned at IA+0) and on instruction address IA+4 (when current access is
aligned at IA+4). However, the setting of PF2I=1 in the 64 bit read mode will cause a prefetch only on
next instruction address IA+4 (independent of current access alignment is IA+0 or IA+4).
Usually prefetching 64 bit is superior to 32 bit only, however it can be the case on strong fragmented
code that the performance deteriorates due to replacement of cache entries. In this case it can be sen-
sible to switch to 32 bit prefetch only.
• BIT[16]: RD64 - Enable 64 bit read mode
Some embedded FLASH memories supports switching the 64 bit read mode to increase the access per-
formance. Please contact Fujitsu if this feature is available on the product you are using.
This bit is cleared after reset. The 32 bit read and write access to the FLASH memory is enabled by de-
fault.
Setting of the RD64 bit implies switching from 32 bit into 64 bit mode. Writing data to the flash memory
is not supported in the 64 bit read only mode.
Important remark: It is not allowed to switch between the 16 bit, the 32 bit and the 64 bit mode while
reading instructions or data from the FLASH memory.
FLASH Cache Control Register (FCHCR)
• BIT[9]: REN - Non-cacheable area Range Enable
The bit is cleared after reset. The address defined in FCHA0 is combined with a bit mask defined in
FCHA1 to define the non-cacheable area.
If the REN bit is set, the non-cacheable area is defined by two points. The non-cacheable range is from
addresses greather than or equal to FCHA0 up to addresses less than or equal to FCHA1.
• BIT[8]: TAGE - TAG RAM access Enable
The bit is set to 0 after reset.
(TAG RAM access is not available on MB91460 series).
0
Prefetch 64 bit (default)
1
Prefetch 32 bit only
0
64 bit read mode is disabled (default)
1
64 bit read mode is enabled
0
FCHA1 defines address mask (default)
1
FCHA1 defines second point for the non-cacheable address range from FCHA0 to FCHA1
0
Memory mapped TAG RAM access disabled (default)
1
Memory mapped TAG RAM access enabled
Summary of Contents for FR Family FR60 Lite
Page 2: ...FUJITSU LIMITED ...
Page 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
Page 15: ...xi ...
Page 16: ...xii ...
Page 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Page 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Page 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 169: ...153 Chapter 9 Reset 10 Caution ...
Page 170: ...154 Chapter 9 Reset 10 Caution ...
Page 180: ...164 Chapter 10 Standby 7 Q A ...
Page 182: ...166 Chapter 10 Standby 8 Caution ...
Page 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
Page 200: ...184 Chapter 12 Instruction Cache 2 Main body structure Figure 2 4 I Cacheable Area ...
Page 222: ...206 Chapter 13 Clock Control 8 Caution ...
Page 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Page 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Page 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Page 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Page 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Page 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Page 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Page 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Page 412: ...396 Chapter 28 Bit Search 8 Caution ...
Page 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Page 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Page 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Page 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Page 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Page 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Page 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Page 790: ...774 Chapter 37 Output Compare 8 Caution ...
Page 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Page 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Page 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Page 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Page 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Page 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Page 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Page 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Page 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Page 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Page 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Page 1032: ...1016 Chapter 55 Flash Security 4 Register ...
Page 1034: ...1018 Chapter 56 Electrical Specification ...
Page 1035: ...FR60 MB91460 Series Hardware Manual European Microcontroller Design Centre Author MBo ...
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