M38039G8HKP datasheet(89/92 Pages) RENESAS

89 / 92 page

Rev.1.10

Nov 14, 2005

Page 89 of 91

REJ03B0166-0110

3803 Group (Spec.H QzROM version)

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

Notes on PWM

The PWM starts from “H” level after the PWM enable bit is set

to enable and “L” level is temporarily output from the PWM pin.

The length of this “L” level output is as follows:

n + 1

• f(XIN)

(s)

(Count source selection bit = “0”,

where n is the value set in the prescaler)

n + 1

f(XIN)

(s)

(Count source selection bit = “1”,

where n is the value set in the prescaler)

Notes on A/D Converter

1. Analog input pin

Make the signal source impedance for analog input low, or equip

an analog input pin with an external capacitor of 0.01

µF to 1 µF.

Further, be sure to verify the operation of application products on

the user side.

An analog input pin includes the capacitor for analog voltage

comparison. Accordingly, when signals from signal source with

high impedance are input to an analog input pin, charge and

discharge noise generates. This may cause the A/D conversion

precision to be worse.

2. A/D converter power source pin

The AVSS pin is A/D converter power source pins. Regardless of

using the A/D conversion function or not, connect it as following :

•AVSS : Connect to the VSS line

If the AVSS pin is opened, the microcomputer may have a failure

because of noise or others.

3. Clock frequency during A/D conversion

The comparator consists of a capacity coupling, and a charge of

the capacity will be lost if the clock frequency is too low. Thus,

make sure the following during an A/D conversion.

•f(XIN) is 500 kHz or more

• Do not execute the STP instruction

4. Difference between at 8-bit reading in 10-bit A/D

mode and at 8-bit A/D mode

At 8-bit reading in the 10-bit A/D mode, “–1/2 LSB” correction

is not performed to the A/D conversion result.

In the 8-bit A/D mode, the A/D conversion characteristics is the

same as 3802 group’s characteristics because “–1/2 LSB”

correction is performed.

Notes on D/A Converter

1. VCC when using D/A converter

The D/A converter accuracy when VCC is 4.0 V or less differs

from that of when VCC is 4.0 V or more. When using the D/A

converter, we recommend using a VCC of 4.0 V or more.

2. D/Ai conversion register when not using D/A con-

verter

When a D/A converter is not used, set all values of the D/Ai

conversion registers (i = 1, 2) to “0016”. The initial value after

reset is “0016”.

Notes on Watchdog Timer

• Make sure that the watchdog timer H does not underflow

while waiting Stop release, because the watchdog timer keeps

counting during that term.

• When the STP instruction disable bit has been set to “1”, it is

impossible to switch it to “0” by a program.

Notes on RESET Pin

Connecting capacitor

In case where the RESET signal rise time is long, connect a

ceramic capacitor or others across the RESET pin and the VSS

pin.

Use a 1000 pF or more capacitor for high frequency use. When

connecting the capacitor, note the following :

• Make the length of the wiring which is connected to a

capacitor as short as possible.

• Be sure to verify the operation of application products on the

user side.

If the several nanosecond or several ten nanosecond impulse

noise enters the RESET pin, it may cause a microcomputer

failure.

Notes on Low-speed Operation Mode

1. Using sub-clock

To use a sub-clock, fix bit 3 of the CPU mode register to “1” or

control the Rd (refer to Figure 7) resistance value to a certain

level to stabilize an oscillation. For resistance value of Rd,

consult the oscillator manufacturer.

Fig 7.

Ceramic resonator circuit

When bit 3 of the CPU mode register is set to “0”, the sub-clock

oscillation may stop.

2. Switch between middle/high-speed mode and low-

speed mode

If you switch the mode between middle/high-speed and low-

speed, stabilize both XIN and XCIN oscillations. The sufficient

time is required for the sub clock to stabilize, especially

immediately after power on and at returning from stop mode.

When switching the mode between middle/high-speed and low-

speed, set the frequency on condition that f(XIN) > 3

•f(XCIN).

Quartz-Crystal Oscillator

When using the quartz-crystal oscillator of high frequency, such

as 16 MHz etc., it may be necessary to select a specific oscillator

with the specification demanded.

XCIN

XCOUT

CCIN

CCOUT

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