M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 460

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

Power Control
2.14.4 Precautions in Power Control
(1) The processor does not switch to stop mode when the NMI pin is at “L” level.
(2) When returning from stop mode by hardware reset, RESET pin must be set to “L” level until
(3) When switching to either wait mode or stop mode, instructions occupying four bytes either
(4) Before the count source for BCLK can be changed from X
(5) Suggestions to reduce power consumption
main clock oscillation is stabilized.
from the WAIT instruction or from the instruction that sets the all clock stop control bit to “1”
within the instruction queue are prefetched and then the program stops. So put at least four
NOPs in succession either to the WAIT instruction or to the instruction that sets the all clock
stop control bit to “1”.
which the count source is going to be switched must be oscillating stably. Allow a wait time in
software for the oscillation to stabilize before switching over the clock.
• Ports
(a) A-D converter
(b) D-A converter
(c) Stopping peripheral functions
(d) Switching the oscillation-driving capacity
(e) External clock
The processor retains the state of each programmable I/O port even when it goes to
wait mode or to stop mode. A current flows in active I/O ports. A pass current flows in
input ports that float. When entering wait mode or stop mode, set non-used ports to
input and stabilize the potential.
A current always flows in the V
the Vref connection bit to “0” so that no current flows into the V
The processor retains the D-A state even when entering wait mode or stop mode.
Disable the output from the D-A converter then work on the programmable I/O ports.
Set D-A register to “00
In wait mode, stop non-used wait peripheral functions using the peripheral function
clock stop bit.
Set the driving capacity to “LOW” when oscillation is stable.
When using an external clock input for the CPU clock, set the main clock stop bit to
“1”. Setting the main clock stop bit to “1” causes the X
power consumption goes down (when using an external clock input, the clock signal
is input regardless of the content of the main clock stop bit).
16
”.
REF
pin. When entering wait mode or stop mode, set
____________
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
______
IN
to X
OUT
CIN
pin not to operate and the
or vice versa, the clock to
REF
Mitsubishi microcomputers
M16C / 62 Group
pin.
445