UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 297

• Manufacturer Part Number: UPD78F0034BGC-8BS-A
• Description: MCU 8-Bit 78K0 CISC 32KB Flash 2.5V/3.3V/5V 64-Pin LQFP
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0034BGC-8BS-A

• Package: 64LQFP
• Family Name: 78K0
• Maximum Speed: 12 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 51
• Interface Type: 3-Wire/UART
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 3

(9) Timing at which A/D conversion result is undefined
(10) Notes on board design
(11) AV
The A/D conversion value may be undefined if the timing of completion of A/D conversion and the timing of
stopping the A/D conversion conflict with each other. Therefore, read the A/D conversion result before stopping
the A/D conversion operation.
Figure 14-17 shows the timing of reading the conversion result.
Locate analog circuits as far away from digital circuits as possible on the board because the analog circuits may
be affected by the noise of the digital circuits. In particular, do not cross an analog signal line with a digital signal
line, or wire an analog signal line in the vicinity of a digital signal line. Otherwise, the A/D conversion
characteristics may be affected by the noise of the digital line.
Connect AV
The AV
pins.
Therefore, be sure to apply the same potential as V
a backup battery for power supply.
Figure 14-17. Timing of Reading Conversion Result (When Conversion Result Is Undefined)
DD
pin
DD
Main power supply
pin is the analog circuit power supply pin. It supplies power to the input circuits of the ANI0 to ANI7
SS0
INTAD0
ADCR0
ADCS0
CHAPTER 14 10-BIT A/D CONVERTER ( PD780034A, 780034AY SUBSERIES)
and V
SS0
A/D conversion completes
Normal conversion result is read.
at one location on the board where the voltages are stable.
Figure 14-18. AV
Normal conversion result
User’s Manual U14046EJ5V0UD
DD0
DD
Pin Connection
to this pin even for applications designed to switch to
A/D conversion completes
Capacitor
for backup
A/D conversion
is stopped.
Undefined value
Undefined value
AV
AV
V
V
AV
SS0
DD0
REF
SS
DD
is read.
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