参数资料
型号: EVAL-ADUC7121QSPZ
厂商: Analog Devices Inc
文件页数: 48/96页
文件大小: 0K
描述: BOARD EVALUATION FOR ADUC7121
设计资源: ADUC7121 Gerber Files
ADUC7121 Schematic
标准包装: 1
系列: MicroConverter® ADuC7xxx
类型: MCU
适用于相关产品: ADUC7121
所含物品: 板,CD
ADuC7121
Data Sheet
Rev. B | Page 52 of 96
GENERAL-PURPOSE INPUT/OUTPUT
The ADuC7121 provides 32 general-purpose, bidirectional
input/output (GPIO) pins. All I/O pins are 5 V tolerant,
meaning that the GPIOs support an input voltage of 5 V. In
general, many of the GPIO pins have multiple functions (see
Table 75). By default, the GPIO pins are configured in GPIO mode.
All GPIO pins have an internal pull-up resistor (of about 100 k)
and their drive capability is 1.6 mA. Note that a maximum of
20 GPIOs can drive 1.6 mA at the same time. The 32 GPIOs are
grouped into four ports: Port 0 to Port 3. Each port is controlled
by four or five MMRs, with x representing the port number.
GPxCON Registers
Name:
GP0CON
Address:
0xFFFF0D00
Default value:
0x11000000
Access:
Read and write
Name:
GP1CON
Address:
0xFFFF0D04
Default value:
0x00000000
Access:
Read and write
Name:
GP2CON
Address:
0xFFFF0D08
Default value:
0x00000000
Access:
Read and write
Name:
GP3CON
Address:
0xFFFF0D0C
Default value:
0x00000000
Access:
Read and write
The input level of any GPIO can be read at any time in the
GPxDAT MMR, even when the pin is configured in a mode
other than GPIO. The PLA input is always active.
When the ADuC7121 device enters a power-saving mode, the
GPIO pins retain their state.
GPxCON is the Port x control register, and it selects the
function of each pin of Port x, as described in Table 75.
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