UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 181

• 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

7.5.1 Main system clock operations
to 0), the following operations are carried out by PCC setting.
(a) Because the operation-guaranteed instruction execution speed depends on the power supply voltage, the
(b) When bit 4 (CSS) of PCC is set to 1 when operating with the main system clock, if bit 7 (MCC) of PCC is set
(c) If bit 7 (MCC) of PCC is set to 1 when operating with the main system clock, the main system clock oscillation
When operating with the main system clock (with bit 5 (CLS) of the processor clock control register (PCC) cleared
minimum instruction execution time can be changed by bits 0 to 2 (PCC0 to PCC2) of PCC.
to 1 after the operation has been switched to the subsystem clock (CLS = 1), the main system clock oscillation
stops (see Figure 7-8 (1)).
does not stop. When bit 4 (CSS) of PCC is set to 1 and the operation is switched to the subsystem clock (CLS
= 1) after that, the main system clock oscillation stops (see Figure 7-8 (2)).
(1) Operation when MCC is set after setting CSS with main system clock operation
(2) Operation when CSS is set after setting MCC with main system clock operation
Main system clock oscillation
Main system clock oscillation
Subsystem clock oscillation
Subsystem clock oscillation
CPU clock
CPU clock
Figure 7-8. Main System Clock Stop Function
MCC
MCC
CSS
CSS
CLS
CLS
CHAPTER 7 CLOCK GENERATOR
Oscillation does not stop
User’s Manual U14046EJ5V0UD
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