UPD78F1502AGK-GAK-AX Datasheet, PDF (443/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 12 OPERATIONAL AMPLIFIER (μ PD78F150xA only)
12.3 Amplifier Registers Used in Operational Amplifier
The operational amplifiers use the following four registers.
• Peripheral enable register 0 (PER0)
• Operational amplifier control register (OAC)
• A/D port configuration register (ADPC)
• Port mode registers 2, 15 (PM2, PM15)
(1) Peripheral enable register 0 (PER0)
PER0 is used to enable or disable use of each peripheral hardware macro. Clock supply to a hardware macro that is
not used is stopped in order to reduce the power consumption and noise.
When the operational amplifier is used, be sure to set bit 5 (ADCEN) of this register to 1.
PER0 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 12-2. Format of Peripheral Enable Register 0 (PER0)
Address: F00F0H After reset: 00H R/W
Symbol
<7>
<6>
<5>
PER0
RTCEN DACEN ADCEN
<4>
IICAEN^Note
<3>
SAU1EN
<2>
SAU0EN
<1>
TAU1EN
<0>
TAU0EN
ADCEN
0
1
Control of A/D converter, operational amplifier, and voltage reference input clock
Stops input clock supply.
• SFR used by the A/D converter, operational amplifier, and voltage reference cannot be
written.
• The A/D converter, operational amplifier, and voltage reference is in the reset status.
Supplies input clock.
• SFR used by the A/D converter, operational amplifier, and voltage reference can be read
and written.
Note 78K0R/LG3, 78K0R/LH3 only
Caution When setting operational amplifier, be sure to set ADCEN to 1 first. If ADCEN = 0,
writing to a control register of operational amplifier is ignored, and, even if the register
is read, only the default value is read
R01UH0004EJ0501 Rev.5.01
427
Jun 20, 2011