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參數資料
| 型號： | UPD17201AGF |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片機與LCD控制器/驅動器和A / D轉換器紅外遙控遞質 |
| 文件頁數： | 33/120頁 |
| 文件大小： | 516K |
| 代理商： | UPD17201AGF |
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μ
PD17201A, 17207
33
6.
CLOCK GENERATOR CIRCUIT
The
μ
PD17207 contains two types of oscillator circuits: the main clock (X) and the subclock (XT) oscillator circuits.
The clock oscillated by either of the circuits can be used as the system clock.
Figure 6-1 shows the configuration of the system clock control register.
Whether the main or subclock is used as the system clock is specified by the SYSCK flag (RF: address 02H, bit
1). By resetting the XEN flag (RF: address 02H, bit 0), oscillation of the main clock can be stopped to reduce current
dissipation.
To use the subclock, be sure to connect a 0.1-
μ
F capacitor to the V
REG
pin to stabilize the oscillation of the subclock.
When the subclock is not used (which is specified by mask option), connect the XT
IN
pin to GND, and XT
OUT
pin to
V
REG
pin.
Fig. 6-1 System Clock Control Register
Specifies mask option
Initial value at reset
Remark
Main clock
Subclock
SYSCK
XEN
Used (USEX)
Used (USEXT)
1
1
Value can be changed
Note
Not used (NOXT)
1
1
Fixed value (cannot be
Not used (NOX)
Used (USEXT)
0
0
changed in software)
Note
SYSCK cannot be changed to 1 and XEN cannot be changed to 0.
XEN
0
1
Function
SYSCK
0
1
Function
Bit 3
Bit 2
Bit 1
Bit 0
0
0
SYSCK
XEN
R/W
0
0
Read/write
Default at reset
R: Read, W: Write
RF: Address 02H
Refer to
the table below
.
(by mask option)
Stops main clock
Oscillates main clock
Selects subclock as system clock
Selects main clock as system clock
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相關代理商/技術參數 |
參數描述 |
|---|---|
| UPD17201AGF-XXX-3B9 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| UPD17202A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UPD17202AGF-011 Preliminary Data Sheet | Data Sheet[05/1997] |
| UPD17202AGF-011 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND KEY SCAN CIRCUIT FOR FPC FRONT PANEL CONTROLLER |
| UPD17202AGF-011-3BE | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND KEY SCAN CIRCUIT FOR FPC FRONT PANEL CONTROLLER |
| UPD17202AGF-XXX-3BE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
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