Power Supply Circuit Related Register - Oki ML63611 User Manual

ML63611 User's Manual
Chapter 15 Power Supply Circuit (POWER)
15.2

Power Supply Circuit Related Register

The halver control register (VHCON) is used to control the power supply circuit.
• Halver control register (VHCON)
VHCON is a 4-bit special function register (SFR) that specifies whether the output voltage of the halver circuit
is used or whether the battery voltage is used as the voltage supplied to the internal different voltage regulator
circuits.
This register is available in the OPTION C and OPTION D (but not in the OPTION A and OPTION B, where
the halver circuit cannot be used).
Halver circuit control
0: Halver circuit OFF
1: Halver circuit ON (initial state)
bit 0: VH
At system reset, VH is set to "1". At this time, the halver circuit enters an operating state and
the output voltage (half the battery voltage) of the halver circuit will be supplied to the internal
different voltage regulator circuits.
When VH is set to "0", the halver circuit stops operating and the battery voltage will be supplied
to the internal different voltage regulator circuits.
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
VHCON (095H)
(R/W)
bit 3 bit 2
 
15 – 2
OPTION B (D): 1.5 V (3.0 V), With regulator
bit 1 bit 0

VH
circuit for LCD bias