SH7101 datasheet(193/560 Pages) RENESAS

193 / 560 page

Section 8 Multifunction Timer Pulse Unit (MTU)

Rev.1.00 Sep. 18, 2008 Page 159 of 522

REJ09B0069-0100

Operation selection

Select counter clock

Periodic counter

Select counter clearing

source

Select output compare

Set period

Free-running counter

Start count operation

<Free-running counter>

Start count operation

[1]

[2]

[3]

[4]

[5]

[1] 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.

[2] For periodic counter

operation, select the TGR

to be used as the TCNT

clearing source with bits

CCLR2 to CCLR0 in TCR.

[3] Designate the TGR

selected in [2] as an output

compare register by means

of TIOR.

[4] Set the periodic counter

cycle in the TGR selected

in [2].

[5] Set the CST bit in TSTR to

1 to start the counter

operation.

Figure 8.3 Example of Counter Operation Setting Procedure

Free-Running Count Operation and Periodic Count Operation: Immediately after a reset, the

MTU’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 MTU requests an interrupt. After

overflow, TCNT starts counting up again from H'0000.

Figure 8.4 illustrates free-running counter operation.

TCNT value

H'FFFF

H'0000

CST bit

TCFV

Time

Figure 8.4 Free-Running Counter Operation

SH7101 Datasheet(PDF) 193 Page - Renesas Technology Corp

SH7101 Datasheet(HTML) 193 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL