20.6.4.4 Receiver and Transmitter Control See 鈥漈" />
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� ATUC128D4-AUR
寤犲晢锛� Atmel
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 282/755闋�(y猫)
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� IC MCU 32BIT 128KB FLASH 48TQFP
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 2,500
绯诲垪锛� AVR®32 UC3 D
鏍稿績铏曠悊鍣細 AVR
鑺珨灏哄锛� 32-浣�
閫熷害锛� 48MHz
閫i€氭€э細 I²C锛孲PI锛孶ART/USART锛孶SB
澶栧湇瑷�(sh猫)鍌欙細 娆犲妾㈡脯(c猫)/寰�(f霉)浣�锛孌MA锛孖²S锛孭OR锛孭WM锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 35
绋嬪簭瀛樺劜(ch菙)鍣ㄥ閲忥細 128KB锛�128K x 8锛�
绋嬪簭瀛樺劜(ch菙)鍣ㄩ鍨嬶細 闁冨瓨
RAM 瀹归噺锛� 16K x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 1.65 V ~ 3.6 V
鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� A/D 6x10b
鎸暕鍣ㄥ瀷锛� 鍏�(n猫i)閮�
宸ヤ綔婧害锛� -40°C ~ 85°C
灏佽/澶栨锛� 48-TQFP
鍖呰锛� 甯跺嵎 (TR)
鍏跺畠鍚嶇ū锛� ATUC128D4-AUR-ND
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352
32133D鈥�11/2011
UC3D
Figure 20-19. SPI Transfer Format (CPHA=0, 8 bits per transfer)
20.6.4.4
Receiver and Transmitter Control
20.6.4.5
Character Transmission and Reception
In SPI master mode, the slave select line (NSS) is asserted low one bit period before the start of
transmission, and released high one bit period after every character transmission. A delay for at
least three bit periods is always inserted in between characters. In order to address slave
devices supporting the Chip Select Active After Transfer (CSAAT) mode, NSS can be forced low
by writing a one to the Force SPI Chip Select bit (CR.RTSEN/FCS). Releasing NSS when FCS
is one, is only possible by writing a one to the Release SPI Chip Select bit (CR.RTSDIS/RCS).
In SPI slave mode, a low level on NSS for at least one bit period will allow the slave to initiate a
transmission or reception. The Underrun Error bit (CSR.UNRE) is set if a character must be sent
while THR is empty, and TXD will be high during character transmission, as if 0xFF was being
sent. If a new character is written to THR it will be sent correctly during the next transmission
slot. Writing a one to CR.RSTSTA will clear UNRE. To ensure correct behavior of the receiver in
SPI slave mode, the master device sending the frame must ensure a minimum delay of one bit
period in between each character transmission.
20.6.4.6
Receiver Time-out
Receiver Time-out鈥檚 are not possible in SPI mode as the baud rate clock is only active during
data transfers.
CLK cycle (for reference)
CLK
(CPOL= 0)
CLK
(CPOL= 1)
MOSI
SPI Master -> TXD
SPI Slave -> RXD
MISO
SPI Master -> RXD
SPI Slave -> TXD
NSS
SPI Master -> RTS
SPI Slave -> CTS
MSB
6
5
MSB
6
5
4
43
32
21
1
LSB
8
7
6
5
4
3
2
1
鐩搁棞(gu膩n)PDF璩囨枡
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