Renesas Single-Chip Microcomputer M306NKT3 User Manual page 87

M306NKT3-RPD-E User's Manual
Notes on Setting "1" to Protect Bit 2 (PRC2) in Division by 2 Mode:
Under the following conditions, even if you enable the PRC2 bit, writing to the register protected by the
PRC2 bit (PD7, PD9, S3C, S4C, S5C and S6C registers) cannot be done properly.
(1) Between when stop mode is released and when a hardware reset is executed
(2) Between when low power dissipation mode is enabled and when a hardware reset is executed
Therefore, if the condition (1) or (2) applies, when you enable the PRC2 bit and write to the register protected
by the PRC2, do not set the CPU clock to the main clock in division by 2 mode.
Note on the Input Thresholds for the Pins P1_5/INT3, P1_6/INT4 and P1_7/INT5
With this product, regarding pins P1_5/INT3, P1_6/INT4 and P1_7/INT5, a device which port or data bus
inputs to and a device which INT interrupt inputs to are different as follows:
Device which port or data bus inputs to: Port emulation FPGA (input level: TTL)
Device which INT interrupt inputs to: Evaluation MCU for emulating peripheral functions (input level:
CMOS Schmidt)
Therefore, the port input level can be read as "H" immediately after an INT interrupt (falling), and the port
input level can be read as "H" immediately before an INT interrupt (rising).
Note on the Input Level for KI0# to KI3#:
With this product, the KI0# to KI3# are TTL input level using the port emulation FPGA although these are
the CMOS Schmidt input level with the actual MCU. Therefore, the wrong interrupt may occur near the
threshold of the TTL level (2.0V to 0.8V) when the input signal is slow changing.
Note on Shifting from On-chip Oscillator Mode to Stop Mode
Do not shift from on-chip oscillator mode or on-chip oscillator low power dissipation mode to stop mode.
Otherwise, this product cannot return by an interrupt.
Note on Final Evaluation:
Be sure to evaluate your system with an evaluation MCU. Before starting mask production, evaluate your
system and make final confirmation with a CS (Commercial Sample) version MCU.
REJ10J0326-0400 Rev.4.00 Sep. 01, 2006
IMPORTANT
4. Hardware Specifications
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