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SH7052 Datasheet(PDF) 765 Page - Renesas Technology Corp |
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SH7052 Datasheet(HTML) 765 Page - Renesas Technology Corp |
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765 / 919 page  739 21.2.2 Mode Transitions When the mode pins and the FWE pin are set in the reset state and a reset-start is executed, the microcomputer enters an operating mode as shown in figure 21.2. In user mode, flash memory can be read but not programmed or erased. The boot, user program and programmer modes are provided as modes to write and erase the flash memory. Boot mode On-board programming mode User program mode User mode Reset state Programmer mode RES = 0 FWE = 1 FWE = 0 *1 *1 *2 Notes: Only make a transition between user mode and user program mode when the CPU is not accessing the flash memory. 1. RAM emulation possible 2. MD0 = 1, MD1 = 1, MD2 = 0 RES = 0 MD1 = 0, MD2 = 1, FWE = 1 RES = 0 RES = 0 MD1 = 1, MD2 = 1, FWE = 0 MD1 = 1, MD2 = 1, FWE = 1 Figure 21.2 Flash Memory State Transitions |
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