Fujitsu FR81S User Manual
CHAPTER 30: POWER CONSUMPTION CONTROL
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : POWER CONSUMPTION CONTROL
FUJITSU SEMICONDUCTOR CONFIDENTIAL
19
5.2. List of Clocks Supplied in Low-power Consumption
Mode
The list of clocks supplied in low-power consumption mode is shown below.
Table 5-1 List of Clocks Supplied in Low-power Consumption Mode
Clock
Standby
Sleep
Stop
Watch
Bus
CPU
CPU clock (CCLK)
○
○
○
×
CAN Prescaler Clock
○
○
*1
×
On-chip bus clock (HCLK)
○
○
○
×
Peripheral clock (PCLK)
○
○
×
×
External bus I/F clock (TCLK)
○
○
*2
×
PLL clock (PLLCLK)
○
○
×
×
Main clock (MCLK)
○
×
×
×
Sub clock (SBCLK)
○
×
×
×
CR oscillation
○*4
○*4
×*3
×*3
○: Stops
×: Does not stop.
(If the main clock/sub clock/PLL clock are stopped by each clock setting register, supply of each clock
stops, accordingly.)
*1: When on-chip bus clock (HCLK) is selected as CAN prescaler clock, this clock stops. When PLL
clock is selected, whether CAN prescalar stops or not depends on PLL output. Otherwise, CAN
prescaler clock does not stop.
prescaler clock does not stop.
*2: This clock is set by the DIVR1:TSTP bit. See "CHAPTER: CLOCK".
*3: During sleep mode, the CR oscillation does not stop, but the watchdog timer 1
*3: During sleep mode, the CR oscillation does not stop, but the watchdog timer 1
(HWWDT) stops.
*4: In order to stop the CR oscillation in standby mode, a setting is needed in advance. See the
description of CSVCR:RCE in "CHAPTER: CLOCK SUPERVISOR".
MB91520 Series
MN705-00010-1v0-E
1106