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| 型號： | 68HC11 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Technical Data |
| 中文描述： | 技術(shù)數(shù)據(jù) |
| 文件頁數(shù)： | 85/336頁 |
| 文件大?。?/td> | 3387K |
| 代理商： | 68HC11 |
Operating Modes and On-Chip Memory
Memory Map
MC68HC11E Family
—
Rev. 4
Technical Data
MOTOROLA
Operating Modes and On-Chip Memory
85
4.4.3 System Initialization
Registers and bits that control initialization and the basic operation of the
MCU are protected against writes except under special circumstances.
Table 4-2
lists registers that can be written only once after reset or that
must be written within the first 64 cycles after reset.
Table 4-2. Write Access Limited Registers
Operating
Mode
Register
Address
Register Name
Must be Written
in First 64 Cycles
Write
Anytime
SMOD = 0
$x024
Timer interrupt mask 2 (TMSK2)
Bits [1:0], once only
Bits [7:2]
$x035
Block protect register (BPROT)
Clear bits, once only
Set bits only
$x039
System configuration
options (OPTION)
Bits [5:4], bits [2:0],
once only
Bits [7:6], bit 3
$x03C
Highest priority I-bit interrupt
and miscellaneous (HPRIO)
See HPRIO
description
See HPRIO
description
$x03D
RAM and I/O map register (INIT)
Yes, once only
—
SMOD = 1
$x024
Timer interrupt mask 2 (TMSK2)
—
All, set or clear
$x035
Block protect register (BPROT)
—
All, set or clear
$x039
System configuration options
(OPTION)
—
All, set or clear
$x03C
Highest priority I-bit interrupt and
miscellaneous (HPRIO)
See HPRIO
description
See HPRIO
description
$x03D
RAM and I/O map register (INIT)
—
All, set or clear
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