SH7052 datasheet(376/919 Pages) RENESAS

376 / 919 page

350

after setting H'FFFF in the cycle register, the cycle register’s compare-match flag and overflow

flag will be set simultaneously.

Note that 0% or 100% duty output is not possible in channel 3 to 5 PWM mode.

An example of channel 3 to 5 PWM mode operation is shown in figure 10.23.

In the example in figure 10.23, H'F0008 is set in GR3D, H'0002 is set in GR3A, GR3B, and

GR3C, and channel 3 is activated; then, during operation, H'0000 is set in GR3A, GR3B, and

GR3C, and output is performed to external pins TIOA3 to TIOC3. Note that 0% duty output is not

possible even though H'0000 is set.

Pø

TCNT3

Clock

TCNT3

GR3D

GR3A–3C

(pulse width)

TSR3

TIO3A–

TIO3C

0000

Cleared by software

0005

0004

0003

0002

0001

0000

0008

0007

0003

0002

0008

0000

0001

0002

0008

Cleared by software

Rewritten by software

Figure 10.23 Channel 3 to 5 PWM Mode Operation

10.3.11

Event Count Function and Event Cycle Measurement

Channel 9 has six 8-bit event counters (ECNT9A to ECNT9F) and corresponding general registers

(GR9A to GR9F). Each event counter has an external pin (TI9A to TI9F).

Each ECNT9 operates unconditionally as an event counter. When an edge is input from the

external pin, ECNT9 is incremented. When ECNT9 matches the value set in GR9, it is cleared,

and then counts up when an edge is again input at the external pin. By making the appropriate

setting in the interrupt enable register (TIER) beforehand, an interrupt request can be sent to the

CPU on compare-match.

For ECNT9A to ECNT9D, a trigger can be transmitted to channel 3 when a compare-match

occurs. In channel 3, if the channel 9 trigger input is set in the timer I/O control register (TIOR)

and the corresponding bit is set to 1 in the timer start register (TSTR), the TCNT3 value is

captured in the corresponding general register (GR3A to GR3D) when an ECNT9A to ECNT9D

compare-match occurs. This enables the event cycle to be measured.

SH7052 Datasheet(PDF) 376 Page - Renesas Technology Corp

SH7052 Datasheet(HTML) 376 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