Fujitsu MB91460 SERIES FR60 User Manual page 758

Chapter 35 Free-Run Timer
7.Q & A
7. Q & A
7.1 What are the types of the internal clock, and how do I select?
There are 4 types of internal clocks, and these are set by the clock selection bit (TCCS.ECLK) and the count
clock bit (TCCS.CLK [1:0]).
Internal clock
To select F /4
CLKP
To select F /16
CLKP
To select F /32
CLKP
To select F /64
CLKP
7.2 How do I select the external clock?
Set with clock selection bits (TCCS.ECLK), data direction bits, and (extra) port function bits.
To use the external
clock input
Free-run Timer 0-7
7.3 How do I enable / disable the count operation of the free-run timer?
Set with count operation bits (TCCS.STOP).
To enable the free-run timer
To stop the free-run timer
742
Setting
Clock selection
Bit (ECLK)
Set to "0"
Set to "0"
Set to "0"
Set to "0"
Setting
The clock The port function bit
selection (PFRxy.z)
bit (ECLK) to "1"
to "1"
Operation
F
Count clock bit
CLKP
(CLK [1:0])
32MHz
Sets to "00" 125 ns
0.5 µs
Set to "01"
Set to "10"
Set to "11"
The extra port
function bit
(EPFRxy.z}
to "1"
Count operation bit (STOP)
Set to "0"
Set to "1"
Count period
=
F = 16MHz
CLKP
250 ns
1 µs
1 µs 2 µs
2 µs 4 µs
Count
Pins
Cycle
CK0- Over 2/F
CLKP
CK7