M30245FCGP 데이터 시트보기 (PDF) - Renesas Electronics

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M30245FCGP

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Renesas Electronics 

M30245 Group

Usage Notes

__________

Using HOLD Signal

__________

When HOLD input is used, set P40 to P47 and P50 to P52 as input before the CPU shifts from single-chip mode to

microprocessor mode or memory expansion mode.

Decreasing Power Consumption

When A/D conversion is not carried out, select not to connect VREF using the VREF connect bit in AD control register

1. To carry out A/D conversion, start the conversion 1µs or longer after connecting VREF.

Microprocessor Mode and Shifting from Microprocessor Mode to Memory Expansion Mode or Single-

chip Mode

In microprocessor mode, the SFR, internal RAM and external memory space can be accessed. Therefore, the

internal ROM area cannot be accessed.

If microprocessor mode is set (“H” is applied to the CNVSS pin) when coming out of a reset, the internal ROM cannot

be accessed even if the CPU shifts to memory expansion mode or single-chip mode.

Resetting when "H" is applied to CNVss pin

If the microprocessor is reset when “H” is applied to the CNVss pin, the internal ROM cannot be read.

Noise

Connect a bypass capacitor (at least 0.1 µF) using the shortest and thickest wire possible.

Input-only Pins

If different power supplies are provided to the system, as shown in Figure 1.213 Circuit example, and the voltage of an

unused input-only pin is higher than Vcc, do not directly connect the dedicated input pin to the power supply. As in the

circuit example indicated by the arrow, connect the input-only pin to the power supply via a resistor rated at approxi-

mately 1 kΩ. The above applies even if the power rise time is different at power-on.

If the voltage of the input pin voltage is higher than Vcc, latch up could occur.

*: A resistor is not required when using a Vcc voltage equal to or higher than the voltage of the dedicated input pin.

Different power supplies

Vcc Dedicated

input pin

(ex. NMI pin)

Different power supplies

Vcc Dedicated

input pin

(ex. NMI pin)

M30245 group

Figure 1.213. Circuit example

Rev.2.00 Oct 16, 2006 page 262 of 264

REJ03B0005-0200

M30245 group

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