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ZLR16300P2001G Datasheet(PDF) 11 Page - Maxim Integrated Products |
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ZLR16300P2001G Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 92 page 19-4622; Rev 0; 5/09 Pin Description Crimzon® ZLR16300 Product Specification 7 Pin Functions XTAL1 Crystal 1 (Time-Based Input) This pin connects a parallel-resonant crystal or ceramic resonator to the on-chip oscillator input. Additionally, an external single-phase clock can be connected to the on-chip oscillator input. XTAL2 Crystal 2 (Time-Based Output) This pin connects a parallel-resonant crystal or ceramic resonant to the on-chip oscillator output. Input/Output Ports The CMOS input buffer for each ports 0, 1, or 2 pin is always connected to the pin, even when the pin is configured as an output. If the pin is configured as an open-drain output and no external signal is applied, a High output state causes the CMOS input buffer to float. This leads to excessive leakage current of more than 100 A. To prevent this leakage, connect the pin to an external signal with a defined logic level or ensure its output state is Low, especially during STOP mode. Internal pull-ups are disabled on any given pin or group of port pins when programmed into output mode. Port 0, 1, and 2 have both input and output capability. The input logic is always present no matter whether the port is configured as input or output. While performing a READ instruction, the MCU reads the actual value at the input logic but not from the output buffer. In addition, the instructions of OR, AND, and XOR have the Read-Modify-Write sequence. The MCU first reads the port, modifies the value, and loads back to the port. Precaution must be taken if the port is configured as open-drain output or if the port is driving any circuit that makes the voltage different from the desired output logic. For example, pins P00–P07 are not connected to anything else. If it is configured as open- drain output with output logic as ONE, it is a floating port and reads back as ZERO. The following instruction sets P00-P07 all Low. AND P0,#%F0 Caution: |
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