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M16C/26 bảng dữ liệu(PDF) 33 Page - Renesas Technology Corp

tên linh kiện M16C/26
Giải thích chi tiết về linh kiện  16-BIT CMOS SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES
PDF  239 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M16C/26 bảng dữ liệu(HTML) 33 Page - Renesas Technology Corp

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Processor Mode
27
Renesas Technology Corp.
M16C/26 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Under
development
Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative and subject to change.
Table 1.7.1. Software waits and bus cycles
Area
Wait bit
Bus cycle
1
2 BCLK cycles
Internal
ROM/RAM
0
1 BCLK cycle
Software wait
A software wait can be inserted by setting the wait bit (bit 7) of the processor mode register 1 (address
000516) (Note) and bits 4 to 7 of the chip select control register (address 000816).
A software wait is inserted in the internal ROM/RAM area by setting the wait bit of processor mode register
1. When set to "0", each bus cycle is executed in one BCLK cycle. When set to "1", each bus cycle is
executed in two BCLK cycles. After the microcomputer has been reset, this bit defaults to "0". When set to
"1", a wait is applied to all memory areas (two BCLK cycles). Set this bit after referring to the recommended
operating conditions (main clock input oscilliation frequecny) of the electrical characteristics.
The SFR area is always accessed in two BCLK cycles regardless of the setting of these control bits.
Table 1.7.1 shows the software wait and bus cycles.
Note: Before attempting to change the contents of the processor mode register 1, set bit 1 of the protect
register (address 000A16) to “1”.



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