Filter
Top Products
217
CHAPTER 13 16-Bit I/O TIMER
13.3.1 Timer Control Status Register (Upper) (TCCSH)
Timer control status register (upper) selects the count clock and the conditions for
clearing the counter, enables the count operation and interrupt, and checks the
interrupt request flag.
■ Timer Control Status Register (Upper) (TCCSH)
Figure 13.3-1 Timer Control Status Register (Upper) (TCCSH)
TCCSH0 : 007943H
0XXXXXXXB
1213 11 10 9 8
15
14
R/W
R/W
X
ECKE
: Read/Write
: Undefined
: Indetermination
: Reset value
Address
Reset value
bit15
ECKE External clock input enable bit
0 Use the internal clock (prescaler output).
1 Use the external clock (FRCK0 pin input).
Table 13.3-2 Function of Timer Control Status Register (Upper) (TCCSH)
Bit name Function
bit15 ECKE :
External clock input enable bit
This bit selects the count clock of the 16-bit free-run timer.
When set to "1": Use the clock inputted from the external pin FRCK0.
When set to "0": Use the internal clock (clock outputted from the
prescaler).
Note:
Set the ECKE bit during stopping of the free-run timer
(TCCSL:STOP=1).
bit14
to
bit8
Undefined bits
Read: The value is undefined
Write: No effect