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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HD6417618A датащи(PDF) 494 Page - Renesas Technology Corp |
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HD6417618A датащи(HTML) 494 Page - Renesas Technology Corp |
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494 / 646 page  Section 17 I/O Ports Rev. 6.00 Jun. 12, 2007 Page 462 of 610 REJ09B0131-0600 17.3.1 Register Description Port C is a 21-bit I/O port that has the following registers. For details on the addresses of these registers and the states of these registers in each processing state, see section 20, List of Registers. • Port C data register H (PCDRH) • Port C data register L (PCDRL) 17.3.2 Port C Data Registers H and L (PCDRH and PCDRL) PCDRH and PCDRL are 16-bit readable/writable registers that stores data for port C. Bits PC20DR to PC0DR correspond to pins PC20 to PC00. (Description of multiplexed functions is omitted.) When the pin function is general output port, if the value is written to PCDRH or PCDRL, the value is output from the pin; if PCDRH or PCDRL is read, the value written to the register is directly read regardless of the pin state. When the pin function is general input port, not the value of register but pin state is directly read if PCDRH or PCDRL is read. Data can be written to PCDRH or PCDRL but no effect on the pin state. Table 17.3 shows the reading/writing function of the port C data registers H and L. • PCDRH Bit Bit Name Initial Value R/W Description 15 to 5 All 0 R Reserved These bits are always read as 0. The write value should always be 0. 4 PC20DR 0 R/W See table 17.3. 3 PC19DR 0 R/W 2 PC18DR 0 R/W 1 PC17DR 0 R/W 0 PC16DR 0 R/W |
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