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HD6432138SW Datasheet(PDF) 211 Page - Renesas Technology Corp |
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HD6432138SW Datasheet(HTML) 211 Page - Renesas Technology Corp |
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211 / 1061 page  Section 6 Bus Controller Rev. 4.00 Jun 06, 2006 page 157 of 1004 REJ09B0301-0400 6.7 Bus Arbitration 6.7.1 Overview The H8S/2138 Group and H8S/2134 Group have a bus arbiter that arbitrates bus master operations. There are two bus masters, the CPU and the DTC, which perform read/write operations when they have possession of the bus. Each bus master requests the bus by means of a bus request signal. The bus arbiter determines priorities at the prescribed timing, and permits use of the bus by means of a bus request acknowledge signal. The selected bus master then takes possession of the bus and begins its operation. 6.7.2 Operation The bus arbiter detects the bus masters’ bus request signals, and if the bus is requested, sends a bus request acknowledge signal to the bus master making the request. If there are bus requests from both bus masters, the bus request acknowledge signal is sent to the one with the higher priority. When a bus master receives the bus request acknowledge signal, it takes possession of the bus until that signal is canceled. The order of priority of the bus masters is as follows: (High) DTC > CPU (Low) |
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