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ST62T03CN3/CCC 参数 Datasheet PDF下载

ST62T03CN3/CCC图片预览
型号: ST62T03CN3/CCC
PDF下载: 下载PDF文件 查看货源
内容描述: 微控制器\n [Microcontroller ]
分类和应用: 微控制器外围集成电路时钟
文件页数/大小: 104 页 / 649 K
品牌: ETC [ ETC ]
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ST6200C/ST6201C/ST6203C  
3.3 OPTION BYTES  
Each device is available for production in user pro-  
grammable versions (OTP) as well as in factory  
coded versions (ROM). OTP devices are shipped  
to customers with a default content (00h), while  
ROM factory coded parts contain the code sup-  
plied by the customer. This implies that OTP de-  
vices have to be configured by the customer using  
the Option Bytes while the ROM devices are facto-  
ry-configured.  
LSB OPTION BYTE  
Bit 7 = PROTECT Readout Protection.  
This option bit enables or disables external access  
to the internal program memory.  
0: Program memory not read-out protected  
1: Program memory read-out protected  
Bit 6 = OSC Oscillator selection.  
This option bit selects the main oscillator type.  
0: Quartz crystal, ceramic resonator or external  
clock  
The two option bytes allow the hardware configu-  
ration of the microcontroller to be selected.  
The option bytes have no address in the memory  
map and can be accessed only in programming  
mode (for example using a standard ST6 program-  
ming tool).  
In masked ROM devices, the option bytes are  
fixed in hardware by the ROM code (see Section  
12.6.2 ”ROM VERSION” on page 97).  
1: RC network  
Bit 5 = Reserved, must be always cleared.  
Bit 4 = Reserved, must be always set.  
The option bytes can be only programmed once. It  
is not possible to change the selected options after  
they have been programmed.  
Bit 3 = NMI PULL NMI Pull-Up on/off.  
This option bit enables or disables the internal pull-  
up on the NMI pin.  
0: Pull-up disabled  
1: Pull-up enabled  
MSB OPTION BYTE  
Bit 15:11 = Reserved, must be always cleared.  
Bit 2 = Reserved, must be always set.  
Bit 10 = Reserved, must be always set.  
Bit 1 = WDACT Hardware or software watchdog.  
This option bit selects the watchdog type.  
0: Software (watchdog to be enabled by software)  
1: Hardware (watchdog always enabled)  
Bit 9 = EXTCNTL External STOP MODE control.  
0: EXTCNTL mode not available. STOP mode is  
not available with the watchdog active.  
1: EXTCNTL mode available. STOP mode is avail-  
able with the watchdog active by setting NMI pin  
to one.  
Bit 0 = OSGEN Oscillator Safeguard on/off.  
This option bit enables or disables the oscillator  
Safeguard (OSG) feature.  
0: Oscillator Safeguard disabled  
1: Oscillator Safeguard enabled  
Bit 8 = LVD Low Voltage Detector on/off.  
This option bit enable or disable the Low Voltage  
Detector (LVD) feature.  
0: Low Voltage Detector disabled  
1: Low Voltage Detector enabled.  
MSB OPTION BYTE  
LSB OPTION BYTE  
15  
8
7
0
EXT  
PRO-  
TECT  
NMI  
PULL  
WD OSG  
Reserved  
CTL  
LVD  
OSC Res. Res.  
Res.  
X
ACT  
EN  
Default  
Value  
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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