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TMP93CS44 bảng dữ liệu(PDF) 23 Page - Toshiba Semiconductor

tên linh kiện TMP93CS44
Giải thích chi tiết về linh kiện  CMOS 16-Bit Microcontroller
PDF  224 Pages
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nhà sản xuất  TOSHIBA [Toshiba Semiconductor]
Trang chủ  http://www.semicon.toshiba.co.jp/eng
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TMP93CS44 bảng dữ liệu(HTML) 23 Page - Toshiba Semiconductor

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TMP93CS44/S45
2004-02-10
93CS44-21
(2) Clock gear controller
When the high-frequency clock fc is selected at SYSCR1<SYSCK>
= “0”, the clock
gear select register SYSCR1<GEAR2:0> sets fFPH to either fc, fc/2, fc/4, fc/8, fc/16.
Switching fFPH with the clock gear reduces the power consumption.
Clock setting example 3:
Changing gear value of the high-frequency clock
SYSCR1
EQU
006FH
LD
(SYSCR1), XXXX0000B
; Changes fSYS to fc/2.
LD
(SYSCR1), XXXX0100B
; Changes fSYS to fc/32.
X: Don’t care
(High-frequency clock gear changing)
To change the frequency of the clock gear, write the value to SYSCR1<GEAR2:0>
register. It is necessary to continue the warm-up time until changing after writing
the register value.
There is a possibility that the instruction next to the clock gear changing
instruction is executed by the clock gear before changing. To execute the
instruction next to the clock gear changing instruction by the clock gear after
changing, input the dummy instruction (Instruction to execute the write cycle) as
follows.
Example: SYSCR1
EQU
006FH
LD
(SYSCR1), XXXX0001B
; Changes fSYS to fc/4.
LD
(DUMMY), 00H
; Dummy instruction.
X: Don’t care
Instruction to be executed by the clock gear after changing



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