参数资料
型号: MC68HC11F1CPU4
厂商: Freescale Semiconductor
文件页数: 94/158页
文件大小: 0K
描述: IC MCU 512 EEPROM 4MHZ 80-LQFP
标准包装: 90
系列: HC11
核心处理器: HC11
芯体尺寸: 8-位
速度: 4MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 30
程序存储器类型: ROMless
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.75 V ~ 5.25 V
数据转换器: A/D 8x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 80-LQFP
包装: 托盘
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 Freescale 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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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