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參數(shù)資料
| 型號： | SAB-C541U-1EP |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP52 |
| 文件頁數(shù)： | 26/65頁 |
| 文件大?。?/td> | 427K |
| 代理商： | SAB-C541U-1EP |
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Semiconductor Group
26
1997-10-01
C540U
C541U
Digital I/O Ports
The C540U/C541U in the P-SDIP-52 package has four 8-bit I/O ports. In the P-LCC-44 package
port 1 is a 6-bit I/O port only. Port 0 is an open-drain bidirectional I/O port, while ports 1 to 3 are
quasi-bidirectional I/O ports with internal pullup resistors. That means, when configured as inputs,
ports 1 to 3 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.
Two port lines of port 1 (P1.0/LED0, P1.1/LED1) and one port line of port 3 (P3.0/LED2) have the
capability of driving external LEDs in the output low state.
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