SH7052 datasheet(370/919 Pages) RENESAS

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Pø

DSTR

DST8A

DCNT

Clock

TO8A

DCNT8A

TSR8

Synchronized with down-counter clock

Cleared by software

0000

0001

0002

0003

0004

0005

Figure 10.17 One-Shot Pulse Output Operation

10.3.6

Offset One-Shot Pulse Function and Output Cutoff Function

By making an appropriate setting in the timer connection register (TCNR), down-counting by

channel 8 down-counters (DCNT8A to DCNT8P) can be started using compare-match signals

from channel 1 general registers (GR1A to GR1H) or channel 1 and 2 compare-match registers

(OCR1, OCR2A to OCR2H). DCNT8A to DCNT8H are connected to channel 1 OCR1 or GR1A

to GR1H, and DCNT8I to DCNT8P are connected to channel 2 OCR2A to OCR2H or GR2A to

GR2H. This enables one-shot pulse output from the external pin (TO8A to TO8P) corresponding

to DCNT. The down-count can be forcibly stopped by making a setting in the one-shot pulse

terminate register (OTR). On channel 1, down-count start or termination by a GR or OCR

compare-match can be selected with the trigger mode register (TRGMDR).

Making a setting in the timer start register (TSTR) starts an up-count by a free-running counter

(TCNT) in channel 1 or 2. When TCNT matches GR or OCR while connection is enabled by

TCNR, the corresponding DSTR is automatically set and DCNT starts counting down. At the

same time, 1 is output from the corresponding external pin (TO8A to TO8P). By making the

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

CPU.

When TCNT1 matches GR or OCR, or TCNT2 matches GR, while channel 8 one-shot pulse

termination by a channel 1 or 2 compare-match signal is enabled by OTR, the corresponding

DSTR is automatically cleared and DCNT stops counting down. DCNT is cleared to H'0000 at

this time, and must be rewritten before the down-count is restarted.

DCNT8I to DCNT8P are connected to the reload register (RLDR8), and when the DSTR

corresponding to DCNT8I to DCNT8P is set, the DCNT8I to DCNT8P counter loads RLDR8

before starting the down-count.

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