ML610Q429-NNNTBZ03A7 Rohm Semiconductor, ML610Q429-NNNTBZ03A7 Datasheet - Page 100

• Manufacturer Part Number: ML610Q429-NNNTBZ03A7
• Description: MCU 8BIT 48K FLASH 128-TQFP
• Manufacturer: Rohm Semiconductor

Specifications of ML610Q429-NNNTBZ03A7

• Core Processor: nX-U8/100
• Core Size: 8-Bit
• Speed: 4.2MHz
• Connectivity: I²C, SSP, UART/USART
• Peripherals: LCD, Melody Driver, POR, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 48KB (24K x 16)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.1 V ~ 3.6 V
• Data Converters: A/D 2x12b, 2x24b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 70°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

6.3.3
The system clock can be switched between high-speed clock (HSCLK) and low-speed clock (LSCLK) by using the
frequency control registers (FCON0, FCON1).
Figure 6-11 shows a flow of system clock switching processing (HSCLK→LSCLK) and Figure 6-12 shows a flow of
system clock switching processing (LSCLK→HSCLK).
Note:
After the power is turned on or if the system clock is switched from HSCLK to LSCLK immediately following return
from the STOP mode, the CPU becomes inactive until LSCLK starts clock supply to the peripheral circuits. Therefore,
It is recommended to switch to LSCLK after confirming that the LSCLK is oscillating by checking that the time base
counter interrupt request bit (Q128H) is “1”.
Switching of System Clock
Low-speed operation mode
System clock switching
Figure 6-11 Flow of System Clock Switching Processing (HSCLK→LSCLK)
SYSCLK←”0”
ENOSC←”0”
System clock switching (High-speed clock→Low-speed clock)
Stop of high-speed oscillation
(* do not need to stop the oscillation if the high-speed clock is used
for any peripheral)
6 – 14
ML610Q428/ML610Q429 User’s Manual
Chapter 6 Clock Generation Circuit