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CHAPTER 2 HANDLING DEVICES
● Note to Noise in the External Reset Pin (RST
)
If the reset pulse applied to the external reset pin (RST
) does not meet the specifications, it may cause
malfunctions. Use caution so that the reset pulse less than the specifications will not be fed to the external
reset pin (RST
).
● External pull-up for the External Reset Pin (RST
) of MB89F202/F202RA
Internal pull-up control for RST
is not available for MB89F202/F202RA. To ensure proper external reset
control in MB89F202/F202RA, an external pull-up (recommend 100 kΩ) for RST
pin must be required.
For MB89F202RA only, high voltage must be applied to RST
during flash memory program / erase. The
typical high voltage is 10 V.
● Step-down circuit stabilization time
The MB89202/F202RA series consists of the products listed in Table 2.1-1 "Pin Processing for the
Products with and without a Step-down Circuit". The operation characteristic depends on whether a product
contains a step-down circuit.
These products use the same internal resources. However, the operation sequence after power-on reset
depends on whether a product contains a step-down circuit. Figure 2.1-1 shows the sequence of operations
after the power-on reset for each model.
Table 2.1-1 Pin Processing for the Products with and without a Step-down Circuit
Product name Operating voltage Step-down circuit
MB89V201 2.7 V to 5.5 V Not contained
MB89202 2.2 V to 5.5 V Not contained
MB89F202/F202RA 3.5 V to 5.5 V Contained