mc68hc05l25 Freescale Semiconductor, Inc, mc68hc05l25 Datasheet - Page 24

• Manufacturer Part Number: mc68hc05l25
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Memory Map
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
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
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.
24
$0011
Register Name (Mnemonic)
Figure
Register Address (Main map unless otherwise specified)
Time Base Control Register 2
Register Name (Full)
2-3. The bit assignments for each register are shown in
Write
(TBCR2)
Figure 2-2. Register Description Key
Reset:
Read
Read:
Write:
MC68HC05L25 Data Sheet, Rev. 3.1
Reset Value
TBIF
—
0
Read-Only Bit
Read/Write Bit
TBIE
0
TBR1
Figure
1
Bit Name (Mnemonic)
TBR0
2-2.
Reserved Bit
1
RTBIF
Figure
0
0
Write-Only Bit
2-4. Reading from
—
0
0
Freescale Semiconductor
COPE
0
COPC
0
0