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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HC705C9AGRS/D 데이터시트(PDF) 152 Page - NXP Semiconductors |
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HC705C9AGRS/D 데이터시트(HTML) 152 Page - NXP Semiconductors |
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152 / 157 page  General Release Specification MC68HC705C9A — Rev. 2.0 A.3 Bootloader Mode Bootloader mode is entered upon the rising edge of RESET if the IRQ is at VTST and the TCAP pin is at logic one. The bootloader code resides in the ROM from $3F00 to $3FEF. This program handles copying of user code from an external EPROM into the on-chip EPROM. The bootload function does not have to be done from an external EPROM, but it may be done from a host. The user code must be a one-to-one correspondence with the internal EPROM addresses. A.4 Bootloader Functions Three pins are used to select various bootloader functions: PD5, PD4, and PD3. Two other pins, PC6 and PC7, are used to drive the PROG LED and the VERF LED, respectively. The programming modes are shown in Table A-2. Table A-1. Operating Modes RESET IRQ TCAP Mode VSS to VDD VTST VSS to VDD VDD User Bootloader Table A-2. Bootloader Functions PD5 PD4 PD3 Mode 0 0 0 Program/Verify 0 0 1 Verify Only 0 1 0 Load RAM and Execute 1 X X Secure Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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