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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8S/2214 数据表(PDF) 210 Page - Renesas Technology Corp |
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H8S/2214 数据表(HTML) 210 Page - Renesas Technology Corp |
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210 / 936 page  Section 6 Bus Controller Rev.4.00 Sep. 18, 2008 Page 150 of 872 REJ09B0189-0400 6.4.5 Wait Control When accessing external space, the H8S/2214 Group can extend the bus cycle by inserting one or more wait states (Tw). There are two ways of inserting wait states: (1) program wait insertion and (2) pin wait insertion using the WAIT pin. (1) Program Wait Insertion From 0 to 3 wait states can be inserted automatically between the T 2 state and T3 state on an individual area basis in 3-state access space, according to the settings of WCRH and WCRL. (2) Pin Wait Insertion Setting the WAITE bit in BCRH to 1 enables wait insertion by means of the WAIT pin. When external space is accessed in this state, program wait insertion is first carried out according to the settings in WCRH and WCRL. Then, if the WAIT pin is low at the falling edge of φ in the last T 2 or T W state, a TW state is inserted. If the WAIT pin is held low, TW states are inserted until it goes high. This is useful when inserting four or more T W states, or when changing the number of TW states for different external devices. The WAITE bit setting applies to all areas. |
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