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SH7018 Datasheet(PDF) 102 Page - Renesas Technology Corp |
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SH7018 Datasheet(HTML) 102 Page - Renesas Technology Corp |
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102 / 431 page  86 7.2.3 Wait Control Register 1 (WCR1) Wait control register 1 (WCR1) is a 16-bit read/write register that specifies the number of wait cycles (0 to 3) for each CS space. WCR1 is initialized to H'FFFF by power-on resets. Bit: 15 14 13 12 11 10 9 8 — — W31 W30 — — W21 W20 Initial value: 1 1 1 1 1 1 1 1 R/W: R R R/W R/W R R R/W R/W Bit: 7 6 5 4 3 2 1 0 — — W11 W10 — — W01 W00 Initial value: 1 1 1 1 1 1 1 1 R/W: R R R/W R/W R R R/W R/W • Bits 15 and 14—Reserved: These bits are always read as 1. The write value should always be 1. • Bits 13 and 12—CS3 Space Wait Specification (W31, W30): These bits specify the number of waits for CS3 space accesses. Bit 13 (W31) Bit 12 (W30) Description 0 0 No wait (external wait input disabled) 1 1-wait external wait input enabled 1 0 2-wait external wait input enabled 1 3-wait external wait input enabled (Initial value) • Bits 11 and 10—Reserved: These bits are always read as 1. The write value should always be 1. |
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