SH7052 datasheet(371/919 Pages) RENESAS

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An example of the offset one-shot pulse output function and output cutoff function is shown in

figure 10.18.

In the example shown in this figure, DCNT8I is started by OCR2A of channel 2, and DCNT8I

output is cut off by GR2A.

Down-count

start trigger

(corresponding bit)

Terminate trigger

(OSTRG0A-P)

First prescaler 1

Second prescaler 1

Start trigger

(OSTRG1A-P)

Down-counter

10A-10P clock

Down-counter

10A-10P

One-shot pulse

(TOA10-TOP10)

One-shot end

interrupt (flag)

One-shot end

detection signal

Synchronized with

down-counter clock

0000

0003

0004

0005

0006

0007

0008

0009

Figure 10.18 Offset One-Shot Pulse Output Function and Output Cutoff Function

Operation

10.3.7

Interval Timer Operation

The interval interrupt request registers (ITVRR1, ITVRR2A, ITVRR2B) are connected to bits 6 to

9 and 10 to 13 of the channel 0 free-running counter (TCNT0). The ITVRR registers are 8-bit

registers; the upper 4 bits (ITVA) are used for A/D converter activation, and the lower 4 bits

(ITVE) are used for interrupt requests. ITVRR1 is connected to A/D converter 2 (AD2),

ITVRR2A to A/D converter 0 (AD0), and ITVRR2B to A/D converter 1 (AD1).

When the ITVA bit for the desired timing is set, the A/D converter is activated when the

corresponding bit of TCNT0 changes to 1.

When the ITVE bit for the desired timing is set, an interrupt can be requested when the

corresponding bit of TCNT0 changes to 1. At this time, the corresponding bit of the timer status

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