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SH7708 bảng dữ liệu(PDF) 222 Page - Renesas Technology Corp

tên linh kiện SH7708
Giải thích chi tiết về linh kiện  SuperH??RISC engine
PDF  633 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7708 bảng dữ liệu(HTML) 222 Page - Renesas Technology Corp

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204
Bit 2n + 1: AnSZ1
Bit 2n: AnSZ0
Bit 0: PORTEN
Description
0
0
0
Reserved (not settable)
1
Byte (8-bit) size
1
0
Word (16-bit) size
1
Longword (32-bit) size
(Initial value)
0
0
1
Reserved (not settable)
1
Byte (8-bit) size
1
0
Word (16-bit) size
1
Reserved (not settable)
Bit 0—Port Function Enable (PORTEN): Designates whether to use the D23–D16 pins as an 8-bit
port. When using this function set the bus widths to word or byte in all areas.
Bit 0: PORTEN
Description
0
D23–D16 are not used as a port.
(Initial value)
1
D23–D16 are used as a port.
10.2.3
Wait State Control Register 1 (WCR1)
Wait state control register 1 (WCR1) is a 16-bit read/write register that specifies the number of
idle (wait) state cycles inserted for each area. For some memories, the drive of the data bus may
not be turned off quickly even when the read signal from the external device is turned off. This
can result in conflicts between data buses when consecutive memory accesses are to different
memories or when a write immediately follows a memory read. The SH7708 Series automatically
inserts idle states equal to the number set in WCR1 in those cases.
WCR1 is initialized to H'3FFF by a power-on reset. It is not initialized by a manual reset or in
standby mode, but retains its contents.



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