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7733 Datasheet(PDF) 66 Page - Renesas Technology Corp |
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7733 Datasheet(HTML) 66 Page - Renesas Technology Corp |
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66 / 940 page  In the memory expansion mode, this pin functions as a programmable I/O port. Furthermore, it can be switched to be a clock The above table indicates the change of pin functions owing to the switching of the processor mode. For each signal’s I/O timing in the memory expantion or microprocessor mode, refer to chapters “12. CONNECTING EXTERNAL DEVICES.” CENTRAL PROCESSING UNIT (CPU) 7733 Group User’s Manual 2–27 Table 2.5.1 Relationship between processor modes and functions of P0 to P4 P31 P32 P30 P33 P47 to P43 P41 P42 P40 P0 P1 HLDA A15 to A8 D(odd) P3 P2 P4 A7 to A0 A15 to A8 D(odd): Data at odd address A23 to A16 D(even) D(even): Data at even address A23 to A16 D D: Data ALE P RDY HOLD f 1 (Note 2) BHE R/W P P P P P Notes 1: Pin P42 can also function as a clock f 1 output pin. (Refer to chapter “12. CONNECTING EXTERNAL DEVICES.”) f 1 output pin when selected by software. In the microprocessor mode, this pin is affected by the signal output disable selection bit (bit 6 at address 6C16 ). (Refer to chapter ) 3: “12. CONNECTING EXTERNAL DEVICES”and “15. ELECTRICAL CHARACTERISTICS.” Pin name Single-chip mode Memory expansion and Microprocessor modes Processor mode s When external data bus is 16 bits wide (BYTE = “L”) s When external data bus is 8 bits wide (BYTE = “H”) s When external data bus is 16 bits wide (BYTE = “L”) s When external data bus is 8 bits wide (BYTE = “H”) P: Functions as a programmable I/O port. P: Functions as a programmable I/O port. P: Functions as a programmable I/O port. P: Functions as a programmable I/O port. P: Functions as a programmable I/O port. P: Functions as a programmable I/O port. (Note 1) 2.5 Processor modes 2: |
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