m38039g6hsp Renesas Electronics Corporation., m38039g6hsp Datasheet - Page 90

• Manufacturer Part Number: m38039g6hsp
• Description: Single-chip 8-bit Cmos Microcomputer
• Manufacturer: Renesas Electronics Corporation.

3803 Group (Spec.H QzROM version)
Rev.1.10
REJ03B0166-0110
Notes on Restarting Oscillation
• Restarting oscillation
Usually, when the MCU stops the clock oscillation by STP
instruction and the STP instruction has been released by an
external interrupt source, the fixed values of Timer 1 and
Prescaler 12 (Timer 1 = “01
automatically reloaded in order for the oscillation to stabilize.
The user can inhibit the automatic setting by writing “1” to bit 0
of MISRG (address 0010
However, by setting this bit to “1”, the previous values, set just
before the STP instruction was executed, will remain in Timer 1
and Prescaler 12. Therefore, you will need to set an appropriate
value to each register, in accordance with the oscillation
stabilizing time, before executing the STP instruction.
<Reason>
Oscillation will restart when an external interrupt is received.
However, internal clock
Timer 1 starts to underflow. This ensures time for the clock
oscillation using the ceramic resonators to be stabilized.
Notes on Using Stop Mode
• Register setting
Since values of the prescaler 12 and Timer 1 are automatically
reloaded when returning from the stop mode, set them again,
respectively. (When the oscillation stabilizing time set after STP
instruction released bit is “0”)
• Clock restoration
After restoration from the stop mode to the normal mode by an
interrupt request, the contents of the CPU mode register previous
to the STP instruction execution are retained. Accordingly, if
both main clock and sub clock were oscillating before execution
of the STP instruction, the oscillation of both clocks is resumed
at restoration.
In the above case, when the main clock side is set as a system
clock, the oscillation stabilizing time for approximately 8,000
cycles of the X
mode. At this time, note that the oscillation on the sub clock side
may not be stabilized even after the lapse of the oscillation
stabilizing time of the main clock side.
Notes on Wait Mode
• Clock restoration
If the wait mode is released by a reset when X
system clock and X
the WIT instruction, X
starts, and X
In the above case, the RESET pin should be held at “L” until the
oscillation is stabilized.
IN
Nov 14, 2005
is set as the system clock.
IN
input is reserved at restoration from the stop
IN
oscillation is stopped during execution of
CIN
16
φ
).
is supplied to the CPU only when
oscillation stops, X
16
”, Prescaler 12 = “FF
Page 90 of 91
CIN
IN
oscillations
is set as the
16
”) are
Notes on Handling of Power Source Pins
In order to avoid a latch-up occurrence, connect a capacitor
suitable for high frequencies as bypass capacitor between power
source pin (V
source pin (V
pin). Besides, connect the capacitor to as close as possible. For
bypass capacitor which should not be located too far from the
pins to be connected, a ceramic capacitor of 0.01
recommended.
Power Source Voltage
When the power source voltage value of a microcomputer is less
than the value which is indicated as the recommended operating
conditions, the microcomputer does not operate normally and
may perform unstable operation.
In a system where the power source voltage drops slowly when
the power source voltage drops or the power supply is turned off,
reset a microcomputer when the power source voltage is less
than the recommended operating conditions and design a system
not to cause errors to the system by this unstable operation.
Electric Characteristic Differences Between Flash
Memory, Mask ROM and QzROM Version MCUs
There are differences in the manufacturing processes and the
mask pattern among flash memory, mask ROM, and QzROM
version MCUs due to the differences of the ROM type. Even
when the ROM type is the same, when the memory size is
different, the manufacturing processes and the mask pattern
differ. For these reasons, the oscillation circuit constants and the
characteristics such as a characteristic value, operation margin,
noise immunity, and noise radiation within the limits of electrical
characteristics may differ.
When manufacturing an application system, please perform
sufficient evaluations in each product. Especially, when
switching a product (example: change from the mask ROM
version to QzROM version), please perform sufficient
evaluations by the switching product in the stage before mass-
producing an application system.
Product Shipped in Blank
As for the product shipped in blank, Renesas does not perform
the writing test to user ROM area after the assembly process
though the QzROM writing test is performed enough before the
assembly process. Therefore, a writing error of approx.0.1 %
may occur. Moreover, please note the contact of cables and
foreign bodies on a socket, etc. because a writing environment
may cause some writing errors.
CC
CC
pin) and GND pin (V
pin) and analog power source input pin (AV
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
SS
pin), and between power
µ
F–0.1
µ
F is
SS