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SH7052 bảng dữ liệu(PDF) 421 Page - Renesas Technology Corp

tên linh kiện SH7052
Giải thích chi tiết về linh kiện  SuperHTM RISC engine
PDF  919 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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SH7052 bảng dữ liệu(HTML) 421 Page - Renesas Technology Corp

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Contention between DCNT Write and Counter Clearing by Underflow: With the channel 8
down-counters (DCNT8A to DCNT8P), if the count is halted due to underflow occurring in the T2
state of a down-counter write cycle by the CPU, retention of the H'0000 value has priority and the
write to DCNT by the CPU is not performed. Writing of 1 to the interrupt status flag (OSF) when
the underflow occurs is performed in the same way as for normal underflow.
The timing in this case is shown in figure 10.72. In this example, a write of H'5555 to DCNT is
attempted at the same time as DCNT underflows.
Pø
T1
DCNT address
Internal write signal
DCNT input clock
Underflow signal
Address
5555
Write data
DCNT
Interrupt status flag
(OSF)
T2
0000
0000
0001
H'0000 retained when DCNT halts
Figure 10.72 Contention between DCNT Write and Underflow



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