Functions Of Operations Of Capture Functions; Capture Function Operation - Fujitsu F2MC-8L F202RA Hardware Manual

8.8

Functions of Operations of Capture Functions

This section describes the capture function operation of the 8/16-bit capture timer/
counter.
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Capture Function Operation

● 8-bit mode
To operate the capture function in the 8-bit mode, the function must be set as shown in Figure 8.8-1 .
DDR3
TCCR
TCR1
TCR0
TCR2
TCPL
0
The 8-bit capture mode is allowed by the capture mode enable/edge detection selection bits (EDGS1 and
EDGS0) of the capture control register (TCCR). "1" is written to the timer start bit (TSTR0) after the clock
source selection bits (TCS02, TCS01, and TCS00) of the timer 0 control register (TCR0) have been set.
In the capture mode, the count value is captured to the capture data register (TCPL) each time a capture
input edge is detected and the capture edge detection flag (CPIF) is set to "1". In this case, if the capture
interrupt enable bit (CPIEN) is already set to "1", an interrupt request is output to the CPU.
The capture mode is divided into free-run mode and clear mode.
Figure 8.8-1 Setting of Capture Function in 8-bit Mode
bit7 bit6 bit5
CPIF CFCLR CPIEN CCMSK TCMSK EDGS1 EDGS0 RESV
TIF1 TFCR1 T1IEN
TIF0 TFCR0 T0IEN
Number of detected events
: Used bit
: Unused bit
: Set "0"
CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER
bit4 bit3 bit2
0
Setting of a value
other than 00
TCS12 TCS11
Setting of a value other
than 111
CINV TCS02 TCS01
Setting of a value other
than 111
bit1 bit0
TCS10 TSTR1
TCS00 TSTR0
PEN TSEL
193