CHAPTER 6 CLOCK GENERATION FUNCTION
User’s Manual U13850EJ4V0UM
168
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 sub clock continues. When this mode is canceled, there is no
need for the oscillator to wait for the oscillation stabilization time, so normal operation can be resumed quickly.
When 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 function are stopped
(except for peripheral functions that are operating with the sub clock). External bus hold requests (HLDRQ) are
not acknowledged.
When the power saving control register (PSC)’s IDLE bit is set to 1, the system switches to IDLE mode.
The operating statuses in IDLE mode are listed in Table 6-2.
(2) Cancellation of IDLE mode
IDLE mode can be canceled by a non-maskable interrupt, an unmasked interrupt request, or a RESET input.
Table 6-2. Operating Statuses in IDLE Mode (1/2)
IDLE Mode Settings
When Sub Clock Exists
When Sub Clock Does Not Exist
CPU
Stopped
ROM correction
Stopped
Clock generator
Both a main clock and sub clock 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)
Stopped
8-bit timer (TM7)
Stopped
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 serial clock
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 for the
µ
PD70303xAY, 70F303wAY.
Item
Содержание MPD703030A
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