ISD94100 Series Technical Reference Manual
Sep 9, 2019
Page
57
of 928
Rev1.09
IS
D
9
410
0
S
ER
IE
S
T
E
C
HN
ICA
L
RE
F
E
RE
NCE
M
AN
U
AL
Standby Power-down mode 1
1
1
5
YES
Deep Power-down mode
1
1
6
YES
Table 6.2.5-2 Power Mode Difference Table
Note:
1. User must turn on LIRC before entering PD, LLPD and SPD0/1 mode.
There are several wake-up sources in Idle mode and Power-down mode. Table 6.2.5-3 lists the
available clocks for each power mode.
Power Mode
Normal Mode
Idle Mode
Power-Down Mode
Definition
CPU is in active state
CPU is in sleep state
CPU is in sleep state and all
clocks stop except LXT and
LIRC. SRAM content retained.
Entry Condition
Chip is in normal mode after
system reset released
CPU executes WFI instruction. CPU sets sleep mode enable
and power down enable and
executes WFI instruction.
Wake-up Sources
N/A
All interrupts
RTC, WDT, I²C, Timer, UART,
BOD, GPIO, EINT, USBD.
Available Clocks
All
All except CPU clock
LXT and LIRC
After Wake-up
N/A
CPU back to normal mode
CPU back to normal mode
Table 6.2.5-3 Power Mode Difference Table
Normal Mode
CPU Clock ON
Power-down Mode
CPU Clock OFF
HXT, HIRC, PCLK OFF
Flash Halt
System reset released
CPU executes WFI
Interrupts occur
Idle Mode
CPU Clock OFF
Flash Halt
1. SLEEPDEEP(SCR[2]) = 1
2. PDEN(CLK_PWRCTL[7]) = 1
3. CPU executes WFI
Wake-up events
occur
LXT, LIRC ON
HXT, HIRC, PCLK ON
LXT, LIRC ON
HXT, HIRC, LXT, LIRC, HCLK, PCLK ON
Flash ON
Figure 6.2-5 ISD94100 Series Power Mode State Machine