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MC68HC711EA9CFS2 bảng dữ liệu(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC68HC711EA9CFS2 bảng dữ liệu(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 58 page MC68HC11EA9 MC68HC11EA9TS/D 11 4.3 Test Mode Test mode, a variation of the expanded mode, is primarily used during Freescale's internal production testing; however, it is accessible for programming the CONFIG register, programming calibration data into EEPROM, and supporting emulation and debugging during development. Refer to Figure 6. 4.4 Bootstrap Mode Bootstrap mode is a special variation of the single-chip mode. Bootstrap mode allows special-purpose programs to be entered into internal RAM. When boot mode is selected at reset, a small bootstrap ROM becomes present in the memory map. Reset and interrupt vectors are located in this ROM at $BFC0– $BFFF. The bootstrap ROM contains a small program which initializes the SCI and allows the user to download a program into on-chip RAM. The size of the downloaded program can be as large as the size of the on-chip RAM. After a four-character delay, or after receiving the character for the highest address in RAM, control passes to the loaded program at $0000. Refer to Figure 6. 4.5 Mode Selection The four mode variations are selected by the logic levels present on the MODA and MODB pins during reset. The MODA and MODB logic levels determine the logic state of SMOD and the MDA control bits in the highest priority I-bit interrupt and miscellaneous (HPRIO) register. See Table 2 for further infor- mation. After reset is released, the mode select pins no longer influence the MCU operating mode. In single- chip operating mode, the MODA pin is connected to a logic level zero. In expanded mode, MODA is normally connected to VDD through a pull-up resistor of 4.7 kΩ. The MODA pin also functions as the load instruction register (LIR) pin when the MCU is not in reset. The LIR signal is useful during program debugging. The open-drain active low LIR output pin drives low during the first E cycle of each instruc- tion. The MODB pin also functions as standby power input (VSTBY), which allows RAM contents to be maintained in absence of VDD. *The reset values of RBOOT, SMOD, and MDA depend on the mode selected at power up. RBOOT — Read Bootstrap ROM/EPROM Valid only when SMOD is set (bootstrap or special test mode). Can only be written in special modes. 0 = Bootstrap ROM disabled and not in map 1 = Bootstrap ROM enabled and in map at $BF00–$BFFF SMOD and MDA — Special Mode Select and Mode Select A These two bits can be read at any time. They can be written anytime in special modes. MDA can only be written once in normal modes. SMOD cannot be set once it has been cleared. HPRIO — Highest Priority I-bit Interrupt and Miscellaneous $103C BIT 7 654321 BIT 0 RBOOT* SMOD* MDA* IRVNE PSEL3 PSEL2 PSEL1 PSEL0 RESET: 00000000 Table 2 Operating Mode Selection Inputs Mode Latched at Reset MODA MODB MDA SMOD 0 1 Single Chip 0 0 1 1 Expanded 1 0 0 0 Bootstrap 0 1 1 0 Special Test 1 1 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
Số phần tương tự - MC68HC711EA9CFS2 |
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Mô tả tương tự - MC68HC711EA9CFS2 |
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