參數資料
型號： MC68HC11A0CFN2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁數： 150/158頁
文件大小： 3803K
代理商： MC68HC11A0CFN2
RESETS, INTERRUPTS, AND LOW POWER MODES
MOTOROLA
TECHNICAL DATA
9-11
9
When set, upon reset in bootstrap mode only, the small bootstrap loader program is
enabled. When clear, by reset in the other three modes, this ROM is disabled and ac-
cesses to this area are treated as external accesses.
SMOD — Special Mode
The special mode bit reflects the inverse of the MODB input pin at the rising edge of
reset. It is set if the MODB pin is low during reset. If MODB is high during reset, it is
cleared. This bit may be cleared under software control from the special modes, thus,
changing the operating mode of the MCU, but may never be set by software.
MDA — Mode Select A
The mode select A bit reflects the status of the MODA input pin at the rising edge of
reset. While the SMOD bit is set (special bootstrap or special test mode in effect) the
MDA bit may be written, thus, changing the operating mode, of the MCU. When the
SMOD bit is clear, the MDA bit is a read-only bit and the operating mode cannot be
changed without going through a reset sequence.
Table 9-5 summarizes the relationship between the SMOD and MDA bits and the
MODB and MODA input pins at the rising edge of reset.
IRV — Internal Read Visibility
The internal read visibility bit is used in the special modes (SMOD = 1) to affect visibil-
ity of internal reads on the expansion data bus. IRV is writeable only if SMOD = 1 and
returns to zero if SMOD = 0. If IRV is clear, visibility of internal reads is blocked. If the
bit is set, internal reads are visible on the external bus.
PSEL3, PSEL2, PSEL1, and PSEL0 — Priority Select
These four priority select bits are used to specify one I bit related interrupt source
which becomes the highest priority I bit related source (Table 9-6). These bits may be
written only while the I bit in CCR = 1 (interrupts masked).
Table 9-5 Mode Bits Relationship
Inputs
Mode Description
Latched at Reset
MODB
MODA
SMOD
MDA
1
0
Single Chip
0
1
Expanded Multiplexed
0
1
0
Special Bootstrap
1
0
1
Special Test
1
1 = Logic High
0 = Logic Low
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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MC68HC11A0CFN3 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
MC68HC11A0CFN3R2 制造商:Rochester Electronics LLC 功能描述:
MC68HC11A0CFN4 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers
MC68HC11A0CFNE3 功能描述:8位微控制器 -MCU 8B MCU 768RAM A/D 3MH RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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