265
Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
9.4.8 Software STOP mode
In this mode, the CPU clock is stopped including the clock generators (oscillator, SSCG and PLL syn-
thesizer), resulting in stop of the entire system for ultra-low power consumption (the only consumed is
device leakage current).
However, if SOSTP bit = “1” the Sub oscillator and Watchdog timer keeps operating increasing STOP
mode current consumption.
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 unnecessary. 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/CA2 peripherals operations are also stopped
(except Sub oscillator and Watchdog timer in case of SOSTP bit = “1”).
The state of the various hardware units in the software STOP mode is tabulated below.
Table 9-11:
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 (Sub OSC operates, if SOSTP bit = “1”)
SSCG/PLL
Stopped
Internal system clock
Stopped
WT clock
Stopped
WDT clock
Stopped, if SOSTP bit = “0”
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, WR1/WR0, CS0, CS[4:2]
H
CLKOUT
L
WAIT
Input value is not sampled
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