LAPIS Semiconductor ML62Q1000 Series, User Manual, Page: 255 / 882

ML62Q1000 Series User's Manual
Chapter 6 Clock Generation Circuit
FEUL62Q1000 6-7
6.2.3 Low-speed Clock Mode Register (FLMOD)
FLMOD is a specific function register (SFR) to control the low-speed clock (LSCLK).
The FLMOD is initialized by only the Power-On-Reset.
This register is unavailable on the ML62Q1300 group.
Address: 0xF004 (FLMOD)
Access: R/W
Access size: 8bit
Initial value: 0x00
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Word
-
Byte
- FLMOD
Bit
- - - - - - - -
LMO
D1
LMO
D0
-
LFLT
SEL
- -
LOSC
M1
LOSC
M0
R/W R R R R R R R R R/W R/W R R/W R R R/W R/W
Initial
value
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit No.
Bit symbol
name
Description
15 to 8 - Reserved bit
7,6 LMOD1,
LMOD0
These bits are used to choose the mode of low-speed crystal oscillation circuit.
These bits are unchangeable when the LOSCM0 bit is "1".
00: Standard mode (Initial value)
01: Low power consumption mode
10: Do not use
11: Tough mode
The low power consumption mode reduces the current consumption by lowering the
oscillation margin than the standard mode. The tough mode increases the oscillation
margin and heightens the resistance against leakage between the pins, increases the
current consumption.
5 - Reserved bit
4 LFLTSEL This bit is used to have a noise filter in the low-speed oscillation circuit.
This bit are unchangeable when the LOSCM0 bit is "1".
0: Use the noise filter (Initial value)
1: Do not use the noise filter
3 - Reserved bit
1,0 LOSCM1,
LOSCM0
This bit is used to choose the clock source of low-speed clock (LSCLK). Low-speed RC
oscillation (approx.32.768kHz), Low-speed crystal oscillation (32.768kHz) or Low-speed
external clock (32.768kHz) can be chosen.
00: Low-speed RC oscillation clock (Initial)
01: Low-speed Crystal oscillation clock
10: Do not use (Low-speed RC oscillation clock)
11: Low-speed External clock input(XT1 pin)
The low-speed crystal oscillation clock and the low-speed external clock mode are not
available to switch directly each other. Change the mode to the low-speed RC oscillation
clock once.
[Note]
Ÿ
Do not change the LOSCM1 bit ad LOSCM0 bit when the ENOSC bit is " 1 " , otherwise the operation is
unguaranteed.