UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 177

• 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

Caution
Remark When using the subsystem clock, replace X1 and X2 with XT1 and XT2, respectively. Also, insert
resistors in series on the XT2 side.
1. When using the main system clock oscillator and subsystem clock oscillator, wire as follows
in the area enclosed by broken lines in Figures 7-4 and 7-5 to avoid an adverse effect from
wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross the wiring with other signal lines. Do not route the wiring near a signal line
• Always make the ground point of the oscillator capacitor the same potential as V
• Do not fetch signals from the oscillator.
Note that the subsystem clock oscillator is designed as a low-amplitude circuit for reducing
power consumption.
Figure 7-6 shows examples of incorrect oscillator connection.
through which a high fluctuating current flows.
not ground the capacitor to a ground pattern through which a high current flows.
(a) Too long wiring
X2
Figure 7-6. Examples of Incorrect Oscillator Connection (1/2)
X1
CHAPTER 7 CLOCK GENERATOR
V
SS1
User’s Manual U14046EJ5V0UD
(b) Crossed signal line
X2
X1
(n = 0 to 7)
PORTn
V
SS1
SS1
. Do
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