参数资料
型号: SAB-C505CA-2R20M
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
封装: PLASTIC, MQFP-44
文件页数: 25/88页
文件大小: 1013K
代理商: SAB-C505CA-2R20M
C505/C505C/C505A/C505CA
Data Sheet
27
12.00
I/O Ports
The C505 has four 8-bit I/O ports and one 2-bit I/O port. Port 0 is an open-drain bidirectional I/O
port, while ports 1 to 4 are quasi-bidirectional I/O ports with internal pullup resistors. That means,
when configured as inputs, ports 1 to 4 will be pulled high and will source current when externally
pulled low. Port 0 will float when configured as input.
The output drivers of port 0 and 2 and the input buffers of port 0 are also used for accessing external
memory. In this application, port 0 outputs the low byte of the external memory address, time
multiplexed with the byte being written or read. Port 2 outputs the high byte of the external memory
address when the address is 16 bits wide. Otherwise, the port 2 pins continue emitting the P2 SFR
contents. In this function, port 0 is not an open-drain port, but uses a strong internal pullup FET .
Port 4 is 2-bit I/O port with CAN controller specific alternate functions. The eight analog input lines
are realized as mixed digital/analog inputs. The 8 analog inputs, AN0-AN7, are located at the port
1 pins P1.0 to P1.7. After reset, all analog inputs are disabled and the related pins of port 1 are
configured as digital inputs. The analog function of a specific port 1 pin is enabled by bits in the SFR
P1ANA. Writing a 0 to a bit position of P1ANA assigns the corresponding pin to operate as analog
input.
Note : P1ANA is a mapped SFR and can be only accessed if bit RMAP in SFR SYSCON is set.
相关PDF资料
PDF描述
SAB-C505CA-4R16M 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44
SAF-C505CA-4R20M 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
SAK-C505A-4E16M 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQFP44
SAK-C505CA-4E20M 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQFP44
SAK-C505-2R20M 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
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