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SC9S12HY64J0CLLR 数据表(PDF) 71 Page - Freescale Semiconductor, Inc |
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SC9S12HY64J0CLLR 数据表(HTML) 71 Page - Freescale Semiconductor, Inc |
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71 / 790 page  Port Integration Module (S12HYPIMV1) MC9S12HY/HA-Family Reference Manual, Rev. 1.04 Freescale Semiconductor 71 2.3.3 Port A Data Register (PORTA) Address 0x0000 (PRR) Access: User read/write1 1 Read: Anytime. The data source is depending on the data direction value. Write: Anytime 76543210 R PA7 PA6 PA5 PA4 PA3 PA2 PA1 PA7 W ———— API_EXTCLK — XIRQ IRQ Altern. Function FP36 FP35 FP34 FP33 FP32 FP31 FP30 FP29 Reset 00000000 Figure 2-1. Port A Data Register (PORTA) Table 2-4. PORTA Register Field Descriptions Field Description 7-4,2 PA Port A general purpose input/output data—Data Register, LCD segment driver output The associated pin can be used as general purpose I/O when not used as alternative function is not enabled. In general purpose output mode the register bit value is driven to the pin. If the associated data direction bit is set to 1, a read returns the value of the port register bit, otherwise the buffered pin input state is read. • The LCD segment driver output takes precedence over the general purpose I/O function if the related LCD segment is enabled. 3 PA Port A general purpose input/output data—Data Register, LCD segment driver output, API_EXTCLK The associated pin can be used as general purpose I/O when not used as alternative function. In general purpose output mode the register bit value is driven to the pin. If the associated data direction bit is set to 1, a read returns the value of the port register bit, otherwise the buffered pin input state is read. • The LCD segment driver output takes precedence over the API_EXTCLK and general purpose I/O function if the related LCD segment is enabled. • The API_EXTCLK takes precedence over the general purpose I/O function if the API_EXTCLK function is enabled 1 PA Port A general purpose input/output data—Data Register, LCD segment driver output, XIRQ The associated pin can be used as general purpose I/O when not used as alternative function. In general purpose output mode the register bit value is driven to the pin. If the associated data direction bit is set to 1, a read returns the value of the port register bit, otherwise the buffered pin input state is read. • The LCD segment driver output takes precedence over the XIRQ and general purpose I/O function if the related LCD segment is enabled. • The XIRQ takes precedence over the general purpose I/O function if the XIRQ function is enabled 0 PA Port A general purpose input/output data—Data Register, LCD segment driver output, IRQ The associated pin can be used as general purpose I/O when not used as alternative function. In general purpose output mode the register bit value is driven to the pin. If the associated data direction bit is set to 1, a read returns the value of the port register bit, otherwise the buffered pin input state is read. • The LCD segment driver output takes precedence over the IRQ and general purpose I/O function if the related LCD segment is enabled. • The IRQ takes precedence over the general purpose I/O function if the IRQ function is enabled |
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