Table of Contents
Example of Normal TPC Output (Example of Five-Phase Pulse Output): Figure 9-5 shows
an example in which the TPC is used for cyclic five-phase pulse output.
TCNT value
TCNT
GRA
H'0000
NDRB
80
C0
PBDR
00
80
TP
15
TP
14
TP
13
TP
12
TP
11
•
The ITU channel to be used as the output trigger channel is set up so that GRA is an output compare
register and the counter will be cleared by compare match A. The trigger period is set in GRA.
The IMIEA bit is set to 1 in TIER to enable the compare match A interrupt.
•
H'F8 is written in PBDDR and NDERB, and bits G3CMS1, G3CMS0, G2CMS1, and G2CMS0 are set in
TPCR to select compare match in the ITU channel set up in step 1 as the output trigger.
Output data H'80 is written in NDRB.
•
The timer counter in this ITU channel is started. When compare match A occurs, the NDRB contents
are transferred to PBDR and output. The compare match/input capture A (IMFA) interrupt service routine
writes the next output data (H'C0) in NDRB.
•
Five-phase overlapping pulse output (one or two phases active at a time) can be obtained by writing
H'40, H'60, H'20, H'30, H'10, H'18, H'08, H'88... at successive IMFA interrupts.
Figure 9-5 Normal TPC Output Example (Five-Phase Pulse Output)
272
Compare match
40
60
20
30
C0
40
60
20
30
10
18
08
88
80
10
18
08
88
Time
C0
40
80
C0
Chapters
Table of Contents
