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參數(shù)資料
| 型號： | MC68HC05L25PB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | TQFP-52 |
| 文件頁數(shù)： | 70/152頁 |
| 文件大?。?/td> | 897K |
| 代理商： | MC68HC05L25PB |
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Memory Map
MC68HC05L25 Data Sheet, Rev. 3.1
24
Freescale Semiconductor
2.2 Input/Output and Control Registers
The I/O and control registers reside in locations $0000 through $003F. A summary of these registers is
shown in Figure 2-3. The bit assignments for each register are shown in Figure 2-4. Reading from
unimplemented bits (denoted with —) will return unknown states (unless explicitly defined to read 0), and
writing to unimplemented bits will have no effect. See also Figure 2-2.
Figure 2-2. Register Description Key
2.2.1 Read/Write Bits
Read/write bits are typically control bits. They are, in general, not modified by a module. Reset: indicates
the initial value of the latch.
2.2.2 Read-Only Bits
Read-only bits are status flag bits. They are indicators of module status. Reset: indicates the value that
will be read immediately after system reset or before the module is enabled.
2.2.3 Write-Only Bits
Write-only bits are control bits. They typically return a state of 0 to prevent an inadvertent write to this bit
by a READ-MODIFY-WRITE instruction. Reset: indicates the value that will be read immediately after
system reset, which is the forced read value (typically 0).
2.2.4 Reserved Bits
Reserved bits are read-only bits that typically read 0. Writes to these bits are ignored, and the user should
not write 1 for future compatibility. Reset: indicates the value that will be read immediately after system
reset which is the forced read value of 0, typically.
$0011
Time Base Control Register 2
(TBCR2)
Read:
TBIF
TBIE
TBR1
TBR0
00
COPE
0
Write:
—RTBIF
—COPC
Reset:
00110000
Register Address (Main map unless otherwise specified)
Bit Name (Mnemonic)
Register Name (Full)
Register Name (Mnemonic)
Read
Write
Read-Only Bit
Read/Write Bit
Reserved Bit
Write-Only Bit
Reset Value
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