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M69KB128AA データシート(PDF) 29 Page - STMicroelectronics |
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M69KB128AA データシート(HTML) 29 Page - STMicroelectronics |
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29 / 68 page  M69KB128AA 7 Configuration registers 29/68 Figure 7. Set Configuration Register (Software Method) 1. Only the Bus Configuration Register (BCR) and the Refresh Configuration Register (RCR) can be modified. 2. To program the BCR or the RCR on last bus write cycle, DQ0-DQ15 must be set to ‘0001h’ and ‘0000’ respectively. 3. The highest order address location is not modified during this operation. 4. The control signal E must be toggled as shown in the above figure. Figure 8. Read Configuration Register (Software Method) 1. To read the BCR, RCR or DIDR on last bus read cycle, DQ0-DQ15 must be set to ‘0001h’, ‘0000’ and ‘0002’ respectively. 2. The highest order address location is not modified during this operation. 3. The control signal E must be toggled as shown in the above figure. Addr. 7FFFFFh E G W LB, UB AI09469f 7FFFFFh 7FFFFFh 7FFFFFh DQ0-DQ15 (2) Configuration Register Data tEHEL2 tEHEL2 tEHEL2 Addr. 7FFFFFh E G W LB, UB AI09470f 7FFFFFh 7FFFFFh 7FFFFFh DQ0-DQ15 (1) Configuration Register Data tEHEL2 tEHEL2 tEHEL2 |
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