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參數(shù)資料
| 型號： | 7549 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機 |
| 文件頁數(shù)： | 44/73頁 |
| 文件大?。?/td> | 1272K |
| 代理商： | 7549 |
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Rev.2.00
REJ03B0202-0200
Mar 05, 2007
Page 44 of 70
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Fig 61. Structure of clock mode register
Note on Clock Circuit
Switching to X
IN
/X
CIN
Oscillator
After a reset is cleared, operation starts using the low-speed on-
chip oscillator. When switching to X
IN
/X
CIN
oscillator, make
sure to set a sufficient wait duration with the on-chip oscillator to
allow the X
IN
/X
CIN
oscillator to stabilize.
Low-speed on-chip oscillator oscillation control bit
(Notes 1, 2, and 4)
0: Oscillation start
1: Oscillation stop
High-speed on-chip oscillator oscillation control bit
(Notes 2 and 4)
0: Oscillation start
1: Oscillation stop
X
IN
oscillation control bit (Notes 2 and 4)
0: Oscillation start
1: Oscillation stop
Oscillation stabilization time set bit after release of the
STP instruction
0: Timer 1 set to “01
16
” and prescaler 12 to “FF
16
”
automatically
1: Un-automatically
Clock selection bits (Notes 3 and 4)
b5 b4
0 0 : Low-speed on-chip oscillator
0 1 : High-speed on-chip oscillator
1 0 : X
IN
/X
CIN
oscillation, External clock
1 1 : Not available
Clock division ratio selection bit
b7 b6
0 0 :
φ
SOURCE/8 (low-speed mode)
0 1 :
φ
SOURCE/4 (middle-speed mode)
1 0 :
φ
SOURCE/2 (high-speed mode)
1 1 : No division (double-speed mode)
b7
Clock mode register
(CLKM: address 0037
16
, initial value: 02
16
)
b0
Notes1:
When stopping the low-speed on-chip oscillator is disabled by setting the low-speed
on-chip oscillator control bit (bit 4 in FSROM2), “1” cannot be written to this bit.
The low-speed on-chip oscillator does not stop even in stop mode.
2:
“1” cannot be written to the oscillation control bits (bits 2 to 0) of the clock selected
as
φ
SOURCE by the clock selection bits.
3:
When “oscillation pins not used” is set by the oscillation method selection bits (bits 1
and 0 in FSROM1), “10
2
” cannot be written to these bits.
4:
Do not change the values of the clock selection bits and the clock oscillation control
bits at the same time using a single instruction. Always use different instructions to
rewrite these values.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 7549_0710 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7549_09 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7-5-4905 | 功能描述:3M 4905 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4905 零件狀態(tài):在售 厚度 - 粘合劑:- 厚度 - 底布，載體:- 標準包裝:1 |
| 754905-1 | 功能描述:PIN ATT/ROLL AUTO IV 制造商:te connectivity amp connectors 系列:* 零件狀態(tài):有效 標準包裝:1 |
| 7-5-4910 | 功能描述:3M 4910 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4910 零件狀態(tài):在售 底布，載體:丙烯酸泡棉 厚度 - 粘合劑:- 厚度 - 底布，載體:- 標準包裝:1 |
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