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| 鍨嬭櫉锛� | PIC18C858-I/L |
| 寤犲晢锛� | Microchip Technology |
| 鏂囦欢闋佹暩(sh霉)锛� | 98/246闋� |
| 鏂囦欢澶у皬锛� | 0K |
| 鎻忚堪锛� | IC PIC MCU OTP 16KX16 84PLCC |
| 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� | Asynchronous Stimulus 8-bit PIC® Microcontroller Portfolio |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 16 |
| 绯诲垪锛� | PIC® 18C |
| 鏍稿績铏曠悊鍣細 | PIC |
| 鑺珨灏哄锛� | 8-浣� |
| 閫熷害锛� | 40MHz |
| 閫ｉ€氭€э細 | CAN锛孖²C锛孲PI锛孶ART/USART |
| 澶栧湇瑷�(sh猫)鍌欙細 | 娆犲妾㈡脯/寰�(f霉)浣�锛孡VD锛孭OR锛孭WM锛學DT |
| 杓稿叆/杓稿嚭鏁�(sh霉)锛� | 68 |
| 绋嬪簭瀛樺劜鍣ㄥ閲忥細 | 32KB锛�16K x 16锛� |
| 绋嬪簭瀛樺劜鍣ㄩ鍨嬶細 | OTP |
| RAM 瀹归噺锛� | 1.5K x 8 |
| 闆诲 - 闆绘簮 (Vcc/Vdd)锛� | 4.2 V ~ 5.5 V |
| 鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� | A/D 16x10b |
| 鎸暕鍣ㄥ瀷锛� | 澶栭儴 |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 灏佽/澶栨锛� | 84-LCC锛圝 褰㈠紩绶氾級 |
| 鍖呰锛� | 绠′欢 |
| 閰嶇敤锛� | AC164310-ND - MODULE SKT FOR PM3 84PLCC DVA18XL840-ND - ADAPTER DEVICE ICE 84PLCC AC174012-ND - MODULE SKT PROMATEII 84PLCC |
| 鍏跺畠鍚嶇ū锛� | PIC18C858I/L |
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187
9157C鈥揂VR鈥�03/12
Atmel ATtiny88 Automotive
19.1.3
Preventing Flash Corruption
During periods of low V
CC, the Flash program can be corrupted because the supply voltage is
too low for the CPU and the Flash to operate properly. These issues are the same as for board
level systems using the Flash, and the same design solutions should be applied.
A Flash program corruption can be caused by two situations when the voltage is too low. First, a
regular write sequence to the Flash requires a minimum voltage to operate correctly. Secondly,
the CPU itself can execute instructions incorrectly, if the supply voltage for executing instructions
is too low.
Flash corruption can easily be avoided by following these design recommendations (one is
sufficient):
1.
Keep the AVR RESET active (low) during periods of insufficient power supply voltage.
This can be done by enabling the internal Brown-out Detector (BOD) if the operating
voltage matches the detection level. If not, an external low V
CC reset protection circuit
can be used. If a reset occurs while a write operation is in progress, the write operation
will be completed provided that the power supply voltage is sufficient.
2.
Keep the AVR core in Power-down sleep mode during periods of low V
CC. This will pre-
vent the CPU from attempting to decode and execute instructions, effectively protecting
the SPMCSR Register and thus the Flash from unintentional writes.
19.1.4
Programming Time for Flash when Using SPM
The calibrated oscillator is used to time Flash accesses. Table 19-1 shows the typical program-
ming time for Flash accesses from the CPU.
19.1.5
Simple Assembly Code Example for a Boot Loader
Note that the RWWSB bit will always be read as zero in ATtiny88. Nevertheless, to ensure com-
patibility with devices supporting Read-While-Write it is recommended to check this bit as shown
in the code example.
;-the routine writes one page of data from RAM to Flash
; the first data location in RAM is pointed to by the Y pointer
; the first data location in Flash is pointed to by the Z-pointer
;-error handling is not included
;-the routine must be placed inside the Boot space
; (at least the Do_spm sub routine). Only code inside NRWW section can
; be read during Self-Programming (Page Erase and Page Write).
;-registers used: r0, r1, temp1 (r16), temp2 (r17), looplo (r24),
; loophi (r25), spmcrval (r20)
; storing and restoring of registers is not included in the routine
; register usage can be optimized at the expense of code size
;-It is assumed that either the interrupt table is moved to the Boot
; loader section or that the interrupts are disabled.
.equ PAGESIZEB = PAGESIZE*2
;PAGESIZEB is page size in BYTES, not words
.org SMALLBOOTSTART
Table 19-1.
SPM Programming Time
Symbol
Min Programming Time
Max Programming Time
Flash write (Page Erase, Page Write, and
write Lock bits by SPM)
3.7 ms
4.5 ms
鐩搁棞(gu膩n)PDF璩囨枡 |
PDF鎻忚堪 |
|---|---|
| PIC18F1330-I/ML | IC PIC MCU FLASH 4KX16 28QFN |
| PIC18F14K50-I/P | IC PIC MCU FLASH 8KX16 20-PDIP |
| PIC18F4439-I/PT | IC MCU FLASH 6KX16 EE A/D 44TQFP |
| PIC18F4450-I/ML | IC PIC MCU FLASH 8KX16 44QFN |
| PIC18F4553-I/P | IC PIC MCU FLASH 16KX16 40-DIP |
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鍙冩暩(sh霉)鎻忚堪 |
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| PIC18C858T-E/L | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 40MHz 16K OTP RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| PIC18C858T-E/PT | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 32KB 1536 RAM 68I/O RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| PIC18C858T-I/L | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 40MHz 16K OTP RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
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