UPD78F1502AGK-GAK-AX Datasheet, PDF (992/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
Function
Details of
Function
APPENDIX C LIST OF CAUTIONS
Cautions
(20/39)
Page
D/A
converter
PER0:
When setting the D/A converter, be sure to set DACEN to 1 first. If DACEN = 0, _{p.420 †}
Peripheral
writing to a control register of the D/A converter is ignored, and, even if the register is
enable register 0 read, only the default value is read.
DACSW0,
Rewriting DACSWn during A/D conversion is prohibited when both the positive _{pp.422 †}
DACSW1: D/A reference voltage of the A/D converter (ADREFP) and the positive reference voltage of _{, 424}
conversion value the D/A converter (DAREF) are the voltage reference output (VREFOUT) (VRSEL = 1 and
setting registers DAREF = 1). Rewrite it when conversion operation is stopped (ADCS = 0).
W0 and W1
Operation of D/A Even if 1, 0, and then 1 is set to the DACEn bit, there is a wait after 1 is set for the _{pp.423 †}
Converter
last time.
, 424
Operation in
normal mode
If the DACSWn or DACSn register is rewritten during the settling time, D/A _{p.423 †}
conversion is aborted and reconversion by using the rewritten values starts.
Operation in
Make the interval between each generation of the INTTM0m signal longer than the _{p.424 †}
real-time output settling time. If an INTTM0m signal is generated during the settling time, D/A
mode
conversion is aborted and reconversion starts.
Even if the generation of the INTTM0m signal and rewriting the DACSWn or DACSn _{p.424 †}
register conflict, the D/A conversion result is output.
Digital port I/O The digital port I/O function, which is the alternate function of the ANO0 and ANO1 _{p.424 †}
function, which pins, does not operate during D/A conversion.
is the alternate When the P11 register is read during D/A conversion, 0 is read in input mode and the
function of the set value of the P11 register is read in output mode. If the digital output mode is set,
ANO0, ANO1 no output data is output to pins.
pins
Operation of the The operation of the D/A converter continues in the HALT and STOP mode. To lower _{p.424 †}
D/A converter the power consumption, therefore, clear the DACEn bit of the DAM register to 0 (D/A
continues in the conversion stop), and execute HALT or STOP instruction.
HALT and STOP
mode
Operational PER0:
When setting operational amplifier, be sure to set ADCEN to 1 first. If ADCEN = 0, p.427 _†
amplifier Peripheral
writing to a control register of operational amplifier is ignored, and, even if the register
enable register 0 is read, only the default value is read.
OAC:
Use the ADPC register to specify as analog inputs the pins to be used with p.428 _†
Operational
operational amplifiers.
amplifier control When using as digital inputs the pins of ports 2 and 15, which are not used with p.428 _†
register
operational amplifiers, when the operational amplifiers are used, make sure that the
input levels are fixed.
ADPC: A/D port Set pins to be used with operational amplifiers in the input mode by using port mode p.429 _†
configuration registers 2 and 15 (PM2, PM15).
register
PM2, PM15:
If a pin is set as an analog input port, not the pin level but “0” is always read.
p.430 _†
Port mode
When an operational amplifier is used, AMPn+, AMPn−, and AMPnO pins are used, pp.431 _†
registers 2 and so the alternative analog input functions cannot be used. The operational amplifier , 432
15
output signals, however, can be used as analog inputs.
Single AMP
To use as an input of the A/D converter a voltage that has been amplified in single p.433 _†
mode
amplifier mode, enable operation in single amplifier mode before selecting an analog
input channel by using the ADS register.
Voltage PER0:
When setting voltage reference, be sure to set ADCEN to 1 first. If ADCEN = 0, p.435 _†
reference Peripheral
writing to a control register of voltage reference is ignored, and, even if the register is
enable register 0 read, only the default value is read.
R01UH0004EJ0501 Rev.5.01
976
Jun 20, 2011