Table 7.1-2 Interval Time Ranges Of Timer 2 In 8-Bit Mode; Table 7.1-3 Interval Time And Square Wave Output Ranges In 16-Bit Mode - Fujitsu F2MC-8L Series Hardware Manual

Table 7.1-2 Interval Time Ranges of Timer 2 in 8-bit Mode

Internal count clock

Table 7.1-3 Interval Time and Square Wave Output Ranges in 16-bit Mode

Count clock cycle
Internal count clock
External clock
t : Instruction cycle (variable with clock mode)
inst
t : External clock cycle (1 t
ext
Tip:
Example of calculating the interval time and square wave frequency
When the count clock cycle is set to 2 t
oscillation (F
equations below are used to obtain the timer 1 interval time and the frequency of the square
wave output from the TO pin during continuous operation without changing the T1DR
register value.
Note that the obtained values assume that the fastest clock (CS1, CS0 = "11"
cycle = 4/F
control register (SYCC).
Interval time = (2 x 4/F
= (8/4.2 MHz) x (221 +1)
= 1422.9
Counter Function
The counter function counts the number of rising edges of external clock signals input to the
external pin (EC pin). Since only timer 1 can select the external clock, the counter function is
available to timer 1 in 8-bit mode or to the 16-bit timer.
• When the counter increments the counting value in synchronization with the external clock
and reaches the set value, the counter inverts the TO pin output level while generating an
interrupt request.
• Timer 1 in 8-bit mode can increment the count up to 2
Count clock cycle
512 t
2 t
2 t
inst
32 t 2
inst
512 t 2
inst
1 t 1 t
ext
greater than or equal to 2 t
ext
) of 4.2 MHz with the timer 1 data register (T1DR) set to "DD
CH
) has been selected for main clock mode (SCS =" 1") in the system clock
CH
) x (T1DR register value + 1)
CH
7.1 Overview of 8/16-bit Timer/Counter
2 t
inst
32 t
inst
inst
Interval time Square wave output range (Hz)
17
to 2 t
inst inst
5 21
t to 2 t
inst inst
9 25
t to 2 t
inst inst
16
to 2 t
ext ext
inst
for operation in 8-bit mode at a main clock
inst
Output frequency = (2 x 8/F
8
.
Interval time
9
2 t to 2 t
inst inst
5 13
2 t to 2 t
inst inst
9 17
2 t to 2 t
inst inst
2 18
1/(2 t ) to 1/(2
inst
6 22
1/(2 t ) to 1/(2
inst
10 26
1/(2 t ) to 1/(2
inst
17
1/(2 t ) to 1/(2 t
ext
)
H
; 1 instruction
B
) x (T1DR register value + 1)
CH
= 4.2 MHz/(16 x (221 +1))
= 1.18 kHz
t )
inst
t )
inst
t )
inst
)
ext
(221)", the
159