参数资料
型号: MC68HC11A1VP2
厂商: ABILIS SYSTEMS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP48
封装: PLASTIC, DIP-48
文件页数: 150/158页
文件大小: 3803K
代理商: MC68HC11A1VP2
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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