H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 490

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 10 16-Bit Timer Pulse Unit (TPU)
Example of count operation setting procedure: Figure 10.6 shows an example of the count
operation setting procedure.
Free-running count operation and periodic count operation: Immediately after a reset, the
TPU’s TCNT counters are all designated as free-running counters. When the relevant bit in TSTR
is set to 1 the corresponding TCNT counter starts up-count operation as a free-running counter.
When TCNT overflows (from H'FFFF to H'0000), the TCFV bit in TSR is set to 1. If the value of
the corresponding TCIEV bit in TIER is 1 at this point, the TPU requests an interrupt. After
overflow, TCNT starts counting up again from H'0000.
Figure 10.7 illustrates free-running counter operation.
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Select output compare register
Select counter clearing source
Start count operation
Select counter clock
Operation selection
<Periodic counter>
Periodic counter
Set period
Figure 10.6 Example of Counter Operation Setting Procedure
[1]
[2]
[3]
[4]
[5]
<Free-running counter>
Free-running counter
Start count operation
[5]
[1]
[2]
[3]
[4]
[5]
Select the counter
clock with bits
TPSC2 to TPSC0 in
TCR. At the same
time, select the
input clock edge
with bits CKEG1
and CKEG0 in TCR.
For periodic counter
operation, select the
TGR to be used as
the TCNT clearing
source with bits
CCLR2 to CCLR0 in
TCR.
Designate the TGR
selected in [2] as an
output compare
register by means of
TIOR.
Set the periodic
counter cycle in the
TGR selected in [2].
Set the CST bit in
TSTR to 1 to start
the counter
operation.