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TMP93CS44 bảng dữ liệu(PDF) 24 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) 24 Page - Toshiba Semiconductor

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TMP93CS44/S45
2004-02-10
93CS44-22
3.3.2
Prescaler Clock Controller
The 9-bit prescaler provides a clock to 8-bit timer 0, 1, 2, 3, 16-bit timer 4, 5, and serial
interface 0, 1.
The clock input to the 9-bit prescaler is selected either fFPH, fc/16, or fs by
SYSCR0<PRCK1:0> register.
<PRCK1:0> register is initialized to “00” by resetting.
When the IDLE 1 mode (Operates only oscillator) is used, set TRUN<PRRUN> to “0” to
stop 9 bit prescaler before “HALT” instruction is executed.
3.3.3
Internal Clock Pin Output Function
CLK pin outputs fSYS divided by 2 internal clock.
Outputs are specified by the clock output control register CKOCR<CLKEN>. Writing “1”
sets clock output, and writing “0” sets high impedance.
After reset, CKOCR<CLKEN> is depended on each product types. It is necessary to set
for each usage. Table 3.3.3 shows the value and operation after reset.
During reset, CLK pin is internally pulled up regardless of the value of <CLKEN>
register. See “TMP93CS44/S45 Reset Timing Chart” in Figure 3.1.1 and Figure 3.1.2.
Table 3.3.3 <CLKEN> and CLK Pin Operation after Reset
Type Number
CKOCR<CLKEN>
CLK Pin Operation
TMP93CS44
0
High impedance
TMP93CS45
1
fSYS/2 clock output
Note: To set <CLKEN>
= “0” and set CLK pin to high impedance, pull up externally to prevent
through current which follows to the input buffer of CLK pin.



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