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Section 33 Power-Down Modes
R01UH0134EJ0400 Rev. 4.00 Page 1805 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
33.2.20 XTAL Crystal Oscillator Gain Control Register (XTALCTR)
XTALCTR is an 8-bit readable/writable register that controls the gain of the crystal oscillator for
XTAL. If the realtime clock uses the XTAL input, XTALCTR retains the previous value when
software standby mode or deep standby mode is canceled by a source other than a power-on reset.
If the realtime clock does not use the XTAL input, XTALCTR is initialized to H’00 when
software standby or deep standby mode is entered. XTALCTR is also initialized to H’00 when
software standby or deep standby mode is canceled by a power-on reset.
Note: When writing to this register, see section 33.4, Usage Notes.
76543210
Bit:
Initial value:
R/W:
00000000
RRRRRRRR/W
------ GAIN-
Bit Bit Name
Initial
Value R/W Description
7 to 1 All 0 R Reserved
These bits are always read as 0. The write value
should always be 0.
0 GAIN 0 R/W XTAL Crystal Oscillator Gain Select
0: Large gain
1: Small gain