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Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
9.4.7 SUB WATCH mode
In this mode f
CPU
clock and the main oscillator are stopped while the sub oscillator continue to operate
to achieve low power, though only oscillator & Watch timer / Watchdog timer continue to operate.
This mode compensates the HALT modes concerning the oscillator stabilization time and power con-
sumption.
At release, for the main oscillator an additional oscillator stabilization time is required.
This mode compensates the WATCH modes concerning the power consumption of the main oscillator.
This mode is entered by configuration the PSM and PSC registers.
In the SUB WATCH mode, program execution is stopped but the contents of all registers and internal
RAM prior to entering this mode are retained. On-chip other peripheral hardware operation is also
stopped.
The state of the various hardware units in the WATCH mode is tabulated below.
Table 9-9:
Operating States in WATCH Mode
Sub WATCH mode release:
The SUB WATCH mode can be released by a non-maskable interrupt request, an unmasked
maskable interrupt request, or RESET signal input.
Items
Operation
Clock generator
Operating
SSCG/PLL
Stopped
Internal system clock
Stopped
WT, WDT clock
Operating
CPU
Stopped
I/O line
Unchanged
Peripheral function
Stops exclude Watch timer / Watchdog timer
TMC calibration input
Main Clock not available
Internal data
Retains all internal data before entering WATCH mode,
such as CPU registers, status, data, and on-chip RAM.
D[15:0], A[23:0]
Hi-Z
RD, WR1/WR0, CS[0], CS[4:2]
H
CLKOUT
L
WAIT
Input value is not sampled
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