CHAPTER 6 CLOCK GENERATION FUNCTION
User’s Manual U13850EJ6V0UD
192
6.4.3 IDLE mode
(1) Settings and operating states
This mode stops the entire system except the watch timer by stopping the on-chip main clock supply while the
clock oscillator is still operating. Supply to the subclock continues. When this mode is released, there is no need
for the oscillator to wait for the oscillation stabilization time, so normal operation can be resumed quickly.
In IDLE mode, program execution is stopped and the contents of all registers and internal RAM are retained as
they were just before IDLE mode was set. In addition, on-chip peripheral functions are stopped (except for
peripheral functions that are operating with the subclock). External bus hold requests (HLDRQ) are not
acknowledged.
When the IDLE bit of the power saving control register (PSC) is set to 1, the system switches to IDLE mode.
The operating statuses in IDLE mode are listed in Table 6-2.
(2) Release of IDLE mode
IDLE mode can be released by a non-maskable interrupt, an unmasked interrupt request, or RESET input.
Table 6-2. Operating Statuses in IDLE Mode (1/2)
IDLE Mode Settings
Item
When Subclock Exists
When Subclock Does Not Exist
CPU
Stopped
ROM correction
Stopped
Clock generator
Both main clock and subclock oscillator
Clock supply to CPU and on-chip peripheral functions is stopped
16-bit timer (TM0)
Operates when INTWTNI is selected as count
clock (f
XT
is selected for watch timer)
Stopped
16-bit timer (TM1)
Stopped
8-bit timer (TM2)
Stopped
8-bit timer (TM3)
Stopped
8-bit timer (TM4)
Operates when f
XT
is selected for count clock
Stopped
8-bit timer (TM5)
Operates when f
XT
is selected for count clock
Stopped
8-bit timer (TM6)
Operates when TO0 is selected as count clock (however, only when TM0 is operating)
8-bit timer (TM7)
Operates when TO0 is selected as count clock (however, only when TM0 is operating)
Watch timer
Operating
Watchdog timer
Stopped
CSI0 to CSI3
Operates when an external clock is selected as the serial clock
I
2
C0
Note
, I
2
C1
Note
Stopped
UART0, UART1
Operates when an external clock is selected as the baud-rate clock (transmit only)
Serial
interface
CSI4
Operates when an external clock is selected as the serial clock
IEBus (V850/SB2 only)
Stopped
A/D converter
Stopped
DMA0 to DMA5
Stopped
Real-time output
Operates when INTTM4 or INTTM5 is
selected (when TM4 or TM5 is operating)
Stopped
Port function
Held
Note
Available only in the Y versions (products with on-chip I
2
C).
Содержание V850/SB1
Страница 2: ...User s Manual U13850EJ6V0UD 2 MEMO ...