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H8S2245 bảng dữ liệu(PDF) 215 Page - Renesas Technology Corp

tên linh kiện H8S2245
Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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Section 6 Bus Controller
Rev.3.00 Mar. 26, 2007 Page 173 of 772
REJ09B0355-0300
If the BREQOE bit in BCRL is set to 1, when an internal bus master wants to make an external
access in the external bus released state, the
BREQO pin is driven low and a request can be made
off-chip to drop the bus request.
When the
BREQ pin is driven high, the BACK pin is driven high at the prescribed timing and the
external bus released state is terminated.
In the event of simultaneous external bus release request, and external access request generation,
the order of priority is as follows:
(High) External bus release > Internal bus master external access (Low)
6.8.3
Pin States in External Bus Released State
Table 6.6 shows pin states in the external bus released state.
Table 6.6
Pin States in Bus Released State
Pins
Pin State
A
23 to A0
High impedance
D
15 to D0
High impedance
CSn
High impedance
AS
High impedance
RD
High impedance
HWR
High impedance
LWR
High impedance



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