Fujitsu F2MC-8L F202RA Hardware Manual page 35

● 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.
Table 2.1-1 Pin Processing for the Products with and without a Step-down Circuit
Product name
MB89V201
MB89202
MB89F202/F202RA
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.
Operating voltage
2.7 V to 5.5 V Not contained
2.2 V to 5.5 V Not contained
3.5 V to 5.5 V Contained
CHAPTER 2 HANDLING DEVICES
Step-down circuit
19