
ML62Q1000 Series User's Manual
Chapter 6
Clock Generation Circuit
FEUL62Q1000
6-11
6.2.7 Backup Clock Status Register (FBUSTAT)
FBUSTAT is a specific function register (SFR) to indicate status of low-speed oscillation clock.
This register is unavailable on the ML62Q1300 group.
The FBUSTAT is used only when choosing the low-speed crystal oscillation clock.
The FBUSTAT is initialized by only Power-On-Reset.
Address:
0xF00C (FBUSTAT)
Access:
R
Access size: 8 bits
Initial value: 0x00
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Word
-
Byte
-
FBUSTAT
Bit
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
LOS
CS
R/W
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Initial
value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Bit No.
Bit symbol
name
Description
15 to 1
-
Reserved bit
0
LOSCS
This bit indicates the status of low-speed crystal oscillation clock.
The bit is set to "1" when LOSCM[1:0] bits of Low-speed Clock Mode Register (FLMOD) is
set to 0x01.
The bit automatically changed from "1" to "0" after the low-speed crystal oscillation circuit is
stabilized and the clock backup interrupt request bit (QCBU) of interrupt request register
(IRQ23) is set.
The LOSCS is "1" when the low-speed crystal oscillation clock is stopped or in
STOP/STOP-D mode.
LOSCS changes from "0" to "1" on the following conditions.
1. When the CPU enters STOP/STOP-D mode
When releasing the STOP/STOP-D mode, it automatically changed from "1" to "0" after the
low-speed crystal oscillation circuit is stabilized and the clock backup interrupt request bit
(QCBU) of interrupt request register (IRQ23) is set.
2. When the low-speed crystal oscillation clock is stopped for 8ms or longer
In this case, the clock backup interrupt request bit (QCBU) of interrupt request register
(IRQ23) is set. After that, if it came back to the normal operation and then the oscillation
circuit got stable, the LOSCS changed from "1" to "0" and the clock backup interrupt
request bit (QCBU) of interrupt request register (IRQ23) is set.
0:
Low-speed crystal clock is stable (Initial value)
1:
Low-speed crystal clock is stopped or the CPU is in the STOP/STOP-D mode
[Note]
Ÿ
In case the LOSCS bit gets to "1" after the LOSCB bit is set to "1", immediately set the mode back to
"
Low-speed RC
oscillation clock
"
by resetting the LOSCM[1:0] of FLMOD register to
"
00
"
and handle it appropriately for the
application.
Ÿ
Refer to the Section 6.3.5 "Switching the Low-speed Clock" to control the LOSCS bit.
Содержание ML62Q1000 Series
Страница 17: ...Chapter 1 Overview...
Страница 112: ...Chapter 2 CPU and Memory Space...
Страница 154: ...Chapter 3 Reset Function...
Страница 166: ...Chapter 4 Power Management...
Страница 196: ...Chapter 5 Interrupts...
Страница 248: ...Chapter 6 Clock generation Circuit...
Страница 274: ...Chapter 7 Low Speed Time Base Counter...
Страница 291: ...Chapter 8 16 Bit Timer...
Страница 320: ...Chapter 9 Functional Timer FTM...
Страница 382: ...Chapter 10 Watchdog Timer...
Страница 402: ...Chapter 11 Serial Communication Unit...
Страница 456: ...Chapter 12 I2 C Bus Unit...
Страница 491: ...Chapter 13 I2 C Master...
Страница 512: ...Chapter 14 DMA Controller...
Страница 531: ...Chapter 15 Buzzer...
Страница 550: ...Chapter 16 Simplified RTC...
Страница 559: ...Chapter 17 GPIO...
Страница 594: ...Chapter 18 External Interrupt Function...
Страница 612: ...Chapter 19 CRC Generator...
Страница 632: ...Chapter 20 Analog Comparator...
Страница 644: ...Chapter 21 D A Converter...
Страница 655: ...Chapter 22 Voltage Level Supervisor...
Страница 676: ...Chapter 23 Successive Approximation Type A D Converter...
Страница 709: ...Chapter 24 Regulator...
Страница 714: ...Chapter 25 Flash Memory...
Страница 743: ...Chapter 26 Code Option...
Страница 750: ...Chapter 27 LCD Driver...
Страница 788: ...Chapter 28 On Chip Debug Function...
Страница 795: ...Chapter 29 Safety Function...
Страница 813: ...Appendix A...
Страница 881: ...Revision History...