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7641 Datasheet(PDF) 99 Page - Renesas Technology Corp |
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7641 Datasheet(HTML) 99 Page - Renesas Technology Corp |
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99 / 385 page  Rev.2.00 Aug 28, 2006 page 82 of 113 7641 Group REJ09B0336-0200 HARDWARE FLASH MEMORY MODE Fig. 79 Block diagram of built-in flash memory (1) CPU Rewrite Mode In CPU rewrite mode, the internal flash memory can be operated on (read, program, or erase) under control of the Central Process- ing Unit (CPU). In CPU rewrite mode, only the User ROM area shown in Figure 79 can be rewritten; the Boot ROM area cannot be rewritten. Make sure the program and block erase commands are issued for only the User ROM area and each block area. The control program for CPU rewrite mode can be stored in either User ROM or Boot ROM area. In the CPU rewrite mode, because the flash memory cannot be read from the CPU, the rewrite con- trol program must be transferred to internal RAM area to be executed before it can be executed. Microcomputer Mode and Boot Mode The control program for CPU rewrite mode must be written into the User ROM or Boot ROM area in parallel I/O mode beforehand. (If the control program is written into the Boot ROM area, the stan- dard serial I/O mode becomes unusable.) See Figure 79 for details about the Boot ROM area. Normal microcomputer mode is entered when the microcomputer is reset with pulling CNVSS pin low. In this case, the CPU starts operating using the control program in the User ROM area. When the microcomputer is reset by pulling the P36 (CE) pin high, the P81 (SCLK) pin high, the CNVSS pin high, the CPU starts oper- ating using the control program in the Boot ROM area. This mode is called the “Boot” mode. Block Address Block addresses refer to the maximum address of each block. These addresses are used in the block erase command. E00016 User ROM area 4 Kbytes FFFF16 Boot ROM area Notes 1: The Boot ROM area can be rewritten in only parallel I/O mode. (Access to any other areas is inhibited.) 2: To specify a block, use the maximum address in the block. Parallel I/O mode CPU rewrite mode, standard serial I/O mode BSEL = “L” BSEL = “H” User area / Boot area select bit = “0” User area / Boot area select bit = “1” C00016 Block 1 : 8 Kbytes Block 2 : 16 Kbytes Block 0 : 8 Kbytes 800016 F00016 FFFF16 E00016 User ROM area 4 Kbytes FFFF16 Boot ROM area C00016 Block 1 : 8 Kbytes Block 2 : 16 Kbytes Block 0 : 8 Kbytes 800016 F00016 FFFF16 |
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