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HT85F2240 Datasheet(PDF) 29 Page - Holtek Semiconductor Inc |
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HT85F2240 Datasheet(HTML) 29 Page - Holtek Semiconductor Inc |
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29 / 147 page  Rev. 1.10 �9 of 147 ���� �1� �01� A/D Flash 8051 Core Low Pin Count MCU HT85F2230/HT85F2240 In-Application Programming – IAP An In-Application Programming interface is provided to allow the end user’s application to erase and reprogram the user code memory. No extra code memory block (bootloader) is required to update the firmware or non-volatile data. Firmware for the IAP and the code memory to be updated are physically on the same IP. Users could update firmware or non-volatile data except for the sector where IAP is located and run. A firmware library is used to provide APIs for flash programming. Flash Program Memory Resisters With regard to the Flash Program Memory registers, there are three address registers, one 8-bit data register and three control registers, located in the Special Function Registers. Read and Write operations to the Flash memory are carried out in 8-bit data operations using the address and data registers and the control registers. The address registers are named FMAR0, FMAR1 and FMAR2, the data register is named FMDR, and the three control registers are named FMKEY, FMCR and FMSR. As these registers are located in Special Function Register area, they can be directly accessed in the same way as any other Special Function Register. Program Memory Register List Register Name Bit 7 6 5 4 3 2 1 0 FMAR0 FADDR7 FADDR6 FADDR� FADDR4 FADDR� FADDR� FADDR1 FADDR0 FMAR1 FADDR1� FADDR14 FADDR1� FADDR1� FADDR11 FADDR10 FADDR9 FADDR8 FMAR� INBLK FADDR�� FADDR�1 FADDR�0 FADDR19 FADDR18 FADDR17 FADDR16 FMDR FDAT7 FDAT6 FDAT� FDAT4 FDAT� FDAT� FDAT1 FDAT0 FMKEY FMKEY7 FMKEY6 FMKEY� FMKEY4 FMKEY� FMKEY� FMKEY1 FMKEY0 FMCR FMCR.7 FMCR.6 — — — FMCR.� FMCR.1 FMCR.0 FMSR UNLOCK — — — FMPF FMSEF FMBF FMBUSY FMAR0 Register – Flash Program Memory Address Register 0 SFR Address: FAh Bit 7 6 5 4 3 2 1 0 Name FADDR7 FADDR6 FADDR� FADDR4 FADDR� FADDR� FADDR1 FADDR0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 0 0 0 0 0 0 0 Bit 7~0 Flash Program Memory address Flash Program Memory address bit 7~bit 0 |
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