參數(shù)資料
型號(hào)： MB90F922NCSPMC
元件分類(lèi)： 微控制器/微處理器
英文描述： MICROCONTROLLER, PQFP120
封裝： 16 X 16 MM, 1.70 MM HEIGHT, 0.50 M PITCH, PLASTIC, LQFP-120
文件頁(yè)數(shù)： 11/72頁(yè)
文件大?。?/td> 2151K
代理商： MB90F922NCSPMC
MB90920 Series
DS07-13750-3E
19
Handling the power supply for high-current output buffer pins (DVCC, DVSS)
Flash memory products and MASK ROM products (MB90F922NC/F922NCS/922NCS/F923NC/
F923NCS/F924NC/F924NCS)
In the Flash memory products and MASK ROM products, the power supply for the high-current output
buffer pins (DVCC, DVSS) is isolated from the digital power supply (VCC).
Therefore, DVcc can therefore be set to a higher voltage than Vcc. If the power supply for the high-current
output buffer pins (DVCC, DVSS) is supplied before the digital power supply (VCC), however, care needs
to be taken because it is possible that the port 7 or port 8 stepping motor outputs may momentarily output
an “H” or “L” level. In order to prevent this, connect the digital power supply (VCC) prior to connecting the
power supply for the high-current output buffer pins. Even when the high-current output buffer pins are
used as general-purpose ports, power should be supplied to the power supply pins for the high-current
output buffer pins (DVCC, DVSS).
Evaluation product (MB90V920-101/MB90V920-102)
In the evaluation products, the power supply for the high-current output buffer pins (DVCC, DVSS) is not
isolated from the digital power supply (VCC). Therefore, DVCC must therefore be set to a lower voltage than
Vcc. The power supply for the high-current output buffer pins (DVCC, DVSS) must always be applied after
the digital power supply (VCC) has been connected, and disconnected before the digital power supply (Vcc)
is disconnected (the power supply for the high-current output buffer pins may also be connected and
disconnected simultaneously with the digital power supply).
Even when the high-current output buffer pins are used as general-purpose ports, power should be
supplied to the power supply pins for the high-current output buffer pins (DVCC, DVSS).
Pull-up/pull-down resistors
MB90920 series does not support internal pull-up/pull-down resistors. Use external components as necessary.
Precautions when not using a sub clock signal
If the X0A and X1A pins are not connected to an oscillator, apply a pull-down resistance to the X0A pin and
leave the X1A pin open.
Notes on operating when the external clock is stopped
The MB90920 series is not guaranteed to operate correctly using the internal oscillator circuit when there is no
external oscillator or the external clock input is stopped.
Flash memory security function
A security bit is located within the Flash memory region. The security function is activated by writing the protection
code 01H to the security bit.
Do not write the value 01H to this address if you are not using the security function.
Please refer to following table for the address of the security bit.
Flash memory size
Address for security bit
MB90F922NC
MB90F922NCS
Built-in 2 Mbits Flash Memory
FC0001H
MB90F923NCS
Built-in 3 Mbits Flash Memory
F80001H
MB90F924NCS
Built-in 4 Mbits Flash Memory
F80001H
相關(guān)PDF資料
PDF描述
MB90F922NCPMC MICROCONTROLLER, PQFP120
MB90F924NCPMC MICROCONTROLLER, PQFP120
MB90F946APF MICROCONTROLLER, PQFP100
MB90F947APF MICROCONTROLLER, PQFP100
MB90F949APF MICROCONTROLLER, PQFP100
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