239
Chapter 8
Clock Generator
Preliminary User’s Manual U14913EE1V0UM00
8.5.6 Software STOP mode
In this mode, the CPU clock is stopped including the clock generators (oscillator and PLL synthesizer),
resulting in stop of the entire system for ultra-low power consumption (the only consumed is device
leakage current). When this mode is released, the oscillation stabilization time for the oscillator should
be secured until the system clock is stabilized. However, when the external clock operates this product,
securing the oscillation stabilization time for the oscillator until the system clock is stabilized is unneces-
sary. In the direct mode as well, the lock-up time does not have to be secured.
This mode is entered by setting the PSM & PSC register.
In this mode, the program execution stops, but the contents of all registers and internal RAM prior to
entering this mode are retained. V850E/CA1 / ATOMIC peripherals operations are also stopped.
The state of the various hardware units in the software STOP mode is tabulated below.
Table 8-11: Operating States in STOP Mode
Note: When the V
DD
value is within the operating range. However, even if V
DD
falls below the lowest
operating voltage, the internal RAM content is retained as long as the data retention voltage
V
DDDR
is maintained.
STOP mode release:
The STOP mode can be released by a non-maskable interrupt request, an unmasked maskable
interrupt request, or RESET signal input.
Items
Operation
Clock generator
Stopped
Internal system clock
Stopped
WT, WDT, LCD clock
Stopped
CPU
Stopped
I/O line
Note
Unchanged
Peripheral function
Stopped
Internal data
Note
Retains all previous internal data, such as CPU registers,
status, data, and on-chip RAM.
D[15:0], A[23:0]
Hi-Z
RD, UWR/LWR, CS[4:2]
H
CLKOUT
L
WAIT
Input value is not sampled
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