ML610Q412P-NNNTB03A7 Rohm Semiconductor, ML610Q412P-NNNTB03A7 Datasheet - Page 148

• Manufacturer Part Number: ML610Q412P-NNNTB03A7
• Description: MCU 8BIT 16K FLASH 120-TQFP
• Manufacturer: Rohm Semiconductor

Specifications of ML610Q412P-NNNTB03A7

• Core Processor: nX-U8/100
• Core Size: 8-Bit
• Speed: 625kHz
• Connectivity: I²C, SSP, UART/USART
• Peripherals: LCD, POR, PWM, WDT
• Number Of I /o: 14
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.1 V ~ 3.6 V
• Data Converters: A/D 2x12b, 2x24b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

10.3.2
The frequency measurement mode in 16-bit timer 2&3, is used to count the frequency of 500kHz RC oscillation clock
which typically has temperature variation and production tolerance.
Using the frequency measurement mode can make better accuracy for uart baud-rate clock or timer function.
(1) Reading the count data, caluculating and setting it to uart communication baud-rate registers, can make more
accurate baud-rate clock.
(2) Reading the count data, caluculating and setting it to a timer data register, can make more accurate timing in normal
timer mode.
Note:
This function is not available on ML610Q415 because it does not have low-speed crystal oscillation clock.
Figure 10-3 shows the operation timing in frequency measurement mode.
(1) High-speed clock (HSCLK, HTBCLK) has to be in oscillating state by conrolling with FCONn registers.
(2) Reset both T2RUN bit (bit0 of TM2CON1 register) and T3RUN bit (bit0 of TM3CON1 register) to “0” to
stop the timer. And then, check both T2STAT bit (bit7 of TM2CON1 register) and T3STAT bit (bit7 of
TM3CON1 register) are “0” for making certain the timer stops.
(3) Set T23MFM bit (bit3 of TM2CON0 register) to “1” (Frequency measurement mode), set T23M16 bit
And also set HTBDR register (High-speed Time Base counter Devide Register) per necessory.
T23MFM
(bit2of TM2CON0 register) to “1” (16bit mode) and set T2CS1-0 bits(bit1/0 of TM2CON0 register) to
“01”(HTBCLK mode).
T2STAT
T23M16
TM3INT
16-bit timer frequency measurement mode operation
T2RUN
{TM3C,TM2C}
FFFF
437C
64Hz
0000
N1
（H）
Figure 10-3 Operation Timing in frequency measurement mode
(3)
(5)
(6)
(7)
10 – 21
ML610Q411/ML610Q412/ML610Q415 User’s Manual
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(8)
Chapter 10 Timers