參數(shù)資料
型號(hào)： AT90S4433-8AC
廠商： Atmel
文件頁數(shù)： 97/126頁
文件大?。?/td> 0K
描述： IC MCU 4K FLSH 8MHZ A/D 32TQFP
標(biāo)準(zhǔn)包裝： 250
系列： AVR® 90S
核心處理器： AVR
芯體尺寸： 8-位
速度： 8MHz
連通性： SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 20
程序存儲(chǔ)器容量： 4KB（2K x 16）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 6x10b
振蕩器型： 外部
工作溫度： 0°C ~ 70°C
封裝/外殼： 32-TQFP
包裝： 托盤
72
AT90S/LS4433
1042H–AVR–04/03
I/O Ports
All AVR ports have true Read-Modify-Write functionality when used as general digital
I/O ports. This means that the direction of one port pin can be changed without uninten-
tionally changing the direction of any other pin with the SBI and CBI instructions. The
same applies for changing drive value (if configured as output) or enabling/disabling of
pull-up resistors (if configured as input).
Port B
Port B is a 6-bit bi-directional I/O port.
Three I/O memory address locations are allocated for the Port B, one each for the Data
Register – PORTB, $18($38), Data Direction Register – DDRB, $17($37), and the Port
B Input Pins – PINB, $16($36). The Port B Input Pins address is read only, while the
Data Register and the Data Direction Register are read/write.
All port pins have individually selectable pull-up resistors. The Port B output buffers can
sink 20 mA and thus drive LED displays directly. When pins PB0 to PB7 are used as
inputs and are externally pulled low, they will source current if the internal pull-up resis-
tors are activated.
The Port B pins with alternate functions are shown in Table 23.
When the pins are used for the alternate function, the DDRB and PORTB Registers
have to be set according to the alternate function description.
Port B Data Register – PORTB
Port B Data Direction Register
– DDRB
Port B Input Pins Address –
PINB
Table 23. Port B Pin Alternate Functions
Port Pin
Alternate Functions
PB0
ICP (Timer/Counter1 Input Capture Pin)
PB1
OC1 (Timer/Counter1 Output Compare Match Output)
PB2
SS (SPI Slave Select Input)
PB3
MOSI (SPI Bus Master Output/Slave Input)
PB4
MISO (SPI Bus Master Input/Slave Output)
PB5
SCK (SPI Bus Serial Clock)
Bit
76543210
$18 ($38)
–
PORTB5
PORTB4
PORTB3
PORTB2
PORTB1
PORTB0
PORTB
Read/Write
R
R/W
Initial Value
00000000
Bit
76543210
$17 ($37)
–
DDB5
DDB4
DDB3
DDB2
DDB1
DDB0
DDRB
Read/Write
R
R/W
Initial Value
00000000
Bit
76543210
$16 ($36)
–
PINB5
PINB4
PINB3
PINB2
PINB1
PINB0
PINB
Read/Write
RRRRRRRR
Initial Value
0
N/A
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