LC86F3448B Datasheet, PDF (9/21 Pages) Sanyo Semicon Device – 8-bit 1-chip Microcontroller

LC86F3448B
• Output form and existence of pull-up resistor for all ports can be specified for each bit.
• Programmable pull-up resistor is always connected regardless of port option, CMOS or N-ch open drain output in
port 1.
User Options
User options can be changed using Flash Memory data.
A kind of option
Pin, Circuits
Input/output form of
input/output ports
Port 0
(Specified in a bit)
Port 1
(Specified in a bit)
1. Input: Without pull-up MOS Tr.
Output: N-channel open drain
2. Input: With pull-up MOS Tr.
Output: CMOS
1. Input: With programmable pull-up MOS Tr.
Output: N-channel open drain
2. Input: With programmable pull-up MOS Tr.
Output: CMOS
Notice for Use
• Input level of terminal RES at power on
Terminal RES must be held low for at least 200µs after the supply voltage exceeds the power supply lower limit.
Power supply
RES
200µs or more
VDD _limit
0V
• Difference between the Mask version and Flash version
1. The operation after release of reset: The mask version operates the program from the address 0 in the
program counter as soon as detecting the H level on the reset port.
The flash version operates the program from the address 0 in the program
counter after setting the option.
2. Current dissipation :
Please refer to the latest semiconductor news.
• Conditions during reset and after release of reset
Port options are set using Flash Memory data.
Port options are set internally within approximately 3ms after logic HIGH is applied to the RESET terminal. The
configuration of the port outputs change over the duration of this period. Then the Program Counter is set to 0 and
program execution begins.
During reset, and in the few hundred milliseconds after reset is released, the port options on certain of the ports will
not yet have been set. The conditions of the various ports during reset or on release of reset have been collected in
the following table. Please refer to it when analyzing circuits where these conditions apply.
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