HD6432670 Hitachi, HD6432670 Datasheet - Page 638

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

12.4.3
Figure 12.5 shows an example in which pulse output is used for cyclic five-phase pulse output.
1. Set up TGRA in TPU which is used as the output trigger to be an output compare register. Set
2. Write H'F8 in P1DDR and NDERH, and set the G3CMS1, G3CMS0, G2CMS1, and G2CMS0
3. The timer counter in the TPU channel starts. When compare match A occurs, the NDRH
4. Five-phase pulse output (one or two phases active at a time) can be obtained subsequently by
Rev. 2.0, 04/02, page 592 of 906
TGRA
H'0000
NDRH
PODRH
PO15
PO14
PO13
PO11
TCNT value
PO12
a cycle in TGRA so the counter will be cleared by compare match A. Set the TGIEA bit in
TIER to 1 to enable the compare match/input capture A (TGIA) interrupt.
bits in PCR to select compare match in the TPU channel set up in the previous step to be the
output trigger. Write output data H'80 in NDRH.
contents are transferred to PODRH and output. The TGIA interrupt handling routine writes the
next output data (H'C0) in NDRH.
writing H'40, H'60, H'20, H'30, H'10, H'18, H'08, H'88... at successive TGIA interrupts.
If the DTC or DMAC is set for activation by the TGIA interrupt, pulse output can be obtained
without imposing a load on the CPU.
Example of Normal Pulse Output (Example of Five-Phase Pulse Output)
Figure 12.5 Normal Pulse Output Example (Five-Phase Pulse Output)
00
80
TCNT
80
C0
C0
40
40
60
Compare match
60
20
20
30
30
10
10
18
18
08
08
88
88
80
80
C0
C0
40
Time