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| 型號(hào)： | ATMEGA103-6AI |
| 廠商： | Atmel |
| 文件頁(yè)數(shù)： | 127/141頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 128K 6MHZ A/D IT 64TQFP |
| 產(chǎn)品培訓(xùn)模塊： | megaAVR Introduction |
| 標(biāo)準(zhǔn)包裝： | 90 |
| 系列： | AVR® ATmega |
| 核心處理器： | AVR |
| 芯體尺寸： | 8-位 |
| 速度： | 6MHz |
| 連通性： | SPI，UART/USART |
| 外圍設(shè)備： | POR，PWM，WDT |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲(chǔ)器容量： | 128KB（64K x 16） |
| 程序存儲(chǔ)器類型： | 閃存 |
| EEPROM 大?。?/td> | 4K x 8 |
| RAM 容量： | 4K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 64-TQFP |
| 包裝： | 托盤 |
| 配用： | ATSTK501-ND - ADAPTER KIT FOR 64PIN AVR MCU |
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ATmega103(L)
0945I–AVR–02/07
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 A
Port A is an 8-bit bi-directional I/O port with internal pull-ups.
Three I/O memory address locations are allocated for Port A, one each for the Data
Register – PORTA, $1B($3B), Data Direction Register – DDRA, $1A($3A) and the Port
A Input Pins – PINA, $19($39). The Port A 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 A output buffers can
sink 20 mA and thus drive LED displays directly. When pins PA0 to PA7 are used as
inputs and are externally pulled low, they will source current if the internal pull-up resis-
tors are activated.
The Port A pins have alternate functions related to the optional external data SRAM.
Port A can be configured to be the multiplexed low-order address/data bus during
accesses to the byte.
When Port A is set to the alternate function by the SRE (External SRAM Enable) bit in
the MCUCR (MCU Control Register), the alternate settings override the Data Direction
Register.
Port A Data Register – PORTA
Port A Data Direction Register
– DDRA
Port A Input Pins Address –
PINA
The Port A Input Pins address (PINA) is not a register; this address enables access to
the physical value on each Port A pin. When reading PORTA the Port A Data Latch is
read and when reading PINA, the logical values present on the pins are read.
Port A as General Digital I/O
All eight pins in Port A have equal functionality when used as digital I/O pins.
PAn, general I/O pin: The DDAn bit in the DDRA Register selects the direction of this
pin. If DDAn is set (one), PAn is configured as an output pin. If DDAn is cleared (zero),
PAn is configured as an input pin. If PORTAn is set (one) when the pin configured as an
input pin, the MOS pull-up resistor is activated. To switch the pull-up resistor off, POR-
TAn has to be cleared (zero) or the pin has to be configured as an output pin. The port
Bit
76543210
$1B ($3B)
PORTA7
PORTA6
PORTA5
PORTA4
PORTA3
PORTA2
PORTA1
PORTA0
PORTA
Read/Write
R/W
Initial Value
00000000
Bit
76543210
$1A ($3A)
DDA7
DDA6
DDA5
DDA4
DDA3
DDA2
DDA1
DDA0
DDRA
Read/Write
R/W
Initial Value
00000000
Bit
76543210
$19 ($39)
PINA7
PINA6
PINA5
PINA4
PINA3
PINA2
PINA1
PINA0
PINA
Read/Write
RRRRRRRR
Initial Value
N/A
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