参数资料
型号: AT90USB1287-16AUR
厂商: Atmel
文件页数: 83/106页
文件大小: 0K
描述: IC MCU AVR 128K ISP USB TQFP64
产品培训模块: megaAVR Introduction
标准包装: 1,000
系列: AVR® 90USB
核心处理器: AVR
芯体尺寸: 8-位
速度: 16MHz
连通性: EBI/EMI,I²C,SPI,UART/USART,USB,USB OTG
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 48
程序存储器容量: 128KB(128K x 8)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-LQFP
包装: 带卷 (TR)
配用: ATSTK600-ND - DEV KIT FOR AVR/AVR32
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
78
7593L–AVR–09/12
AT90USB64/128
11.3.1
MCUCR – MCU Control Register
Bit 4 – PUD: Pull-up Disable
When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and
PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See “Con-
figuring the pin” on page 72 for more details about this feature.
11.3.2
Alternate functions of Port A
The Port A has an alternate function as the address low byte and data lines for the External
Memory Interface.
Table 11-4 and Table 11-5 on page 79 relates the alternate functions of Port A to the overriding
signals shown in Figure 11-5 on page 76.
Bit
7
6
5
4
3
2
1
0
JTD
–PUD
IVSEL
IVCE
MCUCR
Read/write
R/W
R
R/W
R
R/W
Initial value
0
Table 11-3.
Port A pins alternate functions.
Port pin
Alternate function
PA7
AD7 (External memory interface address and data bit 7)
PA6
AD6 (External memory interface address and data bit 6)
PA5
AD5 (External memory interface address and data bit 5)
PA4
AD4 (External memory interface address and data bit 4)
PA3
AD3 (External memory interface address and data bit 3)
PA2
AD2 (External memory interface address and data bit 2)
PA1
AD1 (External memory interface address and data bit 1)
PA0
AD0 (External memory interface address and data bit 0)
Table 11-4.
Overriding signals for alternate functions in PA7..PA4.
Signal
name
PA7/AD7
PA6/AD6
PA5/AD5
PA4/AD4
PUOE
SRE
PUOV
~(WR | ADA (1))
PORTA7 PUD
~(WR | ADA)
PORTA6 PUD
~(WR | ADA)
PORTA5 PUD
~(WR | ADA)
PORTA4 PUD
DDOE
SRE
DDOV
WR | ADA
PVOE
SRE
PVOV
A7 ADA | D7
OUTPUT WR
A6 ADA | D6
OUTPUT WR
A5 ADA | D5
OUTPUT WR
A4 ADA | D4
OUTPUT WR
DIEOE
0
DIEOV
0
DI
D7 INPUTD6 INPUTD5 INPUTD4 INPUT
AIO
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