參數資料
型號: AT90USB647-AU
廠商: Atmel
文件頁數: 79/106頁
文件大?。?/td> 0K
描述: IC AVR MCU 64K 64TQFP
產品培訓模塊: megaAVR Introduction
標準包裝: 450
系列: AVR®
應用: USB 微控制器
核心處理器: AVR
程序存儲器類型: 閃存(64 kB)
控制器系列: AT90 USB
RAM 容量: 4K x 8
接口: 2 線串行,SPI 串行,USART,USB
輸入/輸出數: 48
電源電壓: 2.7 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-TQFP,64-VQFP
包裝: 托盤
供應商設備封裝: 64-TQFP
配用: ATSTK600-RC17-ND - STK600 ROUTING CARD AVR
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
其它名稱: AT90USB647-16AU
AT90USB647-16AU-ND
74
7593L–AVR–09/12
AT90USB64/128
Figure 11-3. Synchronization when reading an externally applied pin value.
Consider the clock period starting shortly after the first falling edge of the system clock. The latch
is closed when the clock is low, and goes transparent when the clock is high, as indicated by the
shaded region of the “SYNC LATCH” signal. The signal value is latched when the system clock
goes low. It is clocked into the PINxn Register at the succeeding positive clock edge. As indi-
cated by the two arrows tpd,max and tpd,min, a single signal transition on the pin will be delayed
between and 1 system clock period depending upon the time of assertion.
When reading back a software assigned pin value, a nop instruction must be inserted as indi-
cated in Figure 11-4. The out instruction sets the “SYNC LATCH” signal at the positive edge of
the clock. In this case, the delay tpd through the synchronizer is one system clock period.
Figure 11-4. Synchronization when reading a software assigned pin value.
The following code example shows how to set port B pins 0 and 1 high, 2 and 3 low, and define
the port pins from 4 to 7 as input with pull-ups assigned to port pins 6 and 7. The resulting pin
values are read back again, but as previously discussed, a nop instruction is included to be able
to read back the value recently assigned to some of the pins.
XXX
in r17, PINx
0x00
0xFF
INSTRUCTIONS
SYNC LATCH
PINxn
r17
XXX
SYSTEM CLK
t
pd, max
t pd, min
out PORTx, r16
nop
in r17, PINx
0xFF
0x00
0xFF
SYSTEM CLK
r16
INSTRUCTIONS
SYNC LATCH
PINxn
r17
t
pd
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