HD6417618A datasheet(355/646 Pages) RENESAS

Nome de Peças	HD6417618A

Descrição Electrónicos	32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series

PDF	646 Pages

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Fabricante Electrônico	RENESAS [Renesas Technology Corp]

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Section 13 Compare Match Timer (CMT)

Rev. 6.00 Jun. 12, 2007 Page 323 of 610

REJ09B0131-0600

13.5.3

Conflict between Byte-Write and Count-Up Processes of CMCNT

Even when the count-up occurs in the T2 cycle while writing to CMCNT in bytes, the byte-writing

has priority over the count-up. In this case, the count-up is not performed. The byte data on

another side, which is not written to, is also not counted and the previous contents remain.

Figure 13.7 shows the timing when the count-up occurs in the T2 cycle while writing to CMCNT

in bytes.

CMCNTH

CMCNT count-up

enable

CMCNTH

CMCNTL

Peripheral operating

clock (P

φ)

Address

Internal write

CMCSR write cycle

Figure 13.7 Conflict between Byte-Write and Count-Up Processes of CMCNT

13.5.4

Conflict between Write Processes to CMCNT with the Counting Stopped and

CMCOR

Writing the same value to CMCNT with the counting stopped and CMCOR is prohibited. If

written, the CMF flag in CMCSR is set to 1 and CMCNT is cleared to H'0000.

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