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HC705RC16GRS/D 数据表(PDF) 29 Page - NXP Semiconductors |
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HC705RC16GRS/D 数据表(HTML) 29 Page - NXP Semiconductors |
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29 / 120 page  Memory Input/Output Programming MC68HC705RC16 — Rev. 3.0 General Release Specification Memory 2.3.3 RAM The user RAM consists of 352 bytes of a shared stack area. The RAM starts at address $0020 and ends at address $017F. The stack begins at address $00FF. The stack pointer can access 64 bytes of RAM in the range $00FF to $00C0. NOTE: Using the stack area for data storage or temporary work locations requires care to prevent it from being overwritten due to stacking from an interrupt or subroutine call. 2.3.4 Bootloader ROM Addresses $3FB0 to $3FEF are reserved ROM addresses that contain the instructions for the bootloader functions. (See Section 10. EPROM.) 2.4 Input/Output Programming In user mode, 20 lines (28-pin PDIP or 28-pin SOIC) or 24 lines (44-lead PLCC) are arranged as three 8-bit I/O ports. These ports are programmable as either inputs or outputs under software control of the data direction registers. For detailed information, refer to Section 7. Parallel Input/Output (I/O). Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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