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參數(shù)資料
| 型號(hào)： | MC68HC11F1MFN4 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, EEPROM, 4 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 99/163頁 |
| 文件大小： | 711K |
| 代理商： | MC68HC11F1MFN4 |
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MOTOROLA
OPERATING MODES AND ON-CHIP MEMORY
MC68HC11F1
4-2
TECHNICAL DATA
The bootstrap ROM contains a small program which initializes the SCI and allows the
user to download a program of up to 1024 bytes into on-chip RAM. After a four-char-
acter delay, or after receiving the character for address $03FF, control passes to the
loaded program at $0000. An external pull-up resistor is required when using the SCI
transmitter pin (TxD) because port D pins are configured for wired-OR operation by
the bootloader. In bootstrap mode, the interrupt vectors point to RAM. This allows the
use of interrupts through a jump table. Refer to Motorola application note AN1060,
M68HC11 Bootstrap Mode.
4.2 On-Chip Memory
The MC68HC11F1 contains 1024 bytes of on-chip RAM and 512 bytes of EEPROM.
The bootloader ROM occupies 256 bytes. The CONFIG register is implemented as a
separate EEPROM byte.
4.2.1 Mapping Allocations
Memory locations for on-chip resources are the same for both expanded and single-
chip modes. The 96-byte register block originates at $1000 after reset and can be
placed at any other 4-Kbyte boundary ($x000) after reset by writing an appropriate val-
ue to the INIT register. Refer to Figure 4-1, which illustrates the memory map.
The on-board 1024-byte RAM is initially located at $0000 after reset. If RAM and reg-
isters are both mapped to the same 4-Kbyte boundary, the first 96 bytes of RAM are
inaccessible (registers have higher priority). Remapping is accomplished by writing
appropriate values to the INIT register.
The 512-byte EEPROM array is initially located at $FE00 after reset when EEPROM
is enabled in the memory map by the CONFIG register. In expanded and special test
modes EEPROM can be placed at any other 4-Kbyte boundary ($xE00) by program-
ming bits EE[3:0] in the CONFIG register to an appropriate value. In single-chip and
bootstrap modes the EEPROM is forced on and cannot be remapped.
In special bootstrap mode, a bootloader ROM is enabled at locations $BF00–$BFFF.
The vectors for special bootstrap mode are contained in the bootloader program. The
boot ROM fills 256 bytes of the memory map even though not all locations are used.
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