ML610Q409-NNNTBZ03A7 Rohm Semiconductor, ML610Q409-NNNTBZ03A7 Datasheet - Page 307

• Manufacturer Part Number: ML610Q409-NNNTBZ03A7
• Description: MCU 8BIT 16K FLASH 4CH 100-TQFP
• Manufacturer: Rohm Semiconductor
• Series: -r

Specifications of ML610Q409-NNNTBZ03A7

• Core Processor: nX-U8/100
• Core Size: 8-Bit
• Speed: 2MHz
• Connectivity: SSP, UART/USART
• Peripherals: LCD, Melody Driver, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.25 V ~ 3.6 V
• Data Converters: A/D 2x16b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 70°C
• Package / Case: 100-TFQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

That completes the operations in First Step.
<Second step>
The RC oscillator circuit (RCOSC0) oscillates with thermistor RT0 from this point until Counter B overflows. This period
is equal to the product of “nB0” obtained in the First Step and the oscillation period t
When Counter B overflows, the RADINT signal is set to “1” and an RC-ADC interrupt request is generated. (Section (d)).
Also, the generation of interrupt request releases HALT mode (section (e)) and at the same time, A/D conversion operation
stops. (Section (f), RARUN bit = "0").
This completes the operations in Second Step.
request is generated. (Section (a)). Also, the generation of interrupt request releases HALT mode (section (b)) and at the
same time, A/D conversion operation stops. (Section (c), RARUN bit = "0"). At this time, Counter A is set to “0000H”.
The content of Counter B at this time is expressed by the following expression:
The content of Counter A at this time becomes the A/D conversion value nA1, which is expressed by the following
expression:
From expressions B and C, nA1 is expressed by the following expression:
where t
by thermistor RT0.
Since the oscillation period is expressed by "t
the following expressions:
When expression E is substituted for expression D, nA1 will be:
Since “nA0” (“4B0H” in this example) and RS0 are constants whose values are fixed, “nA1” is a digital value
proportional to RT0. This very “nA1” corresponds to “nT0” in expression A.
That concludes the description of the A/D conversion method using a thermistor. “nA1” that has been obtained must
further be converted to a value such as a temperature indication value for thermometer by program according to the
temperature-to-resistance characteristics of the thermistor.
t
t
nB0
nA1
nA1
nA1
RCCLK
RCCLK
At this point, Counter A needs to be cleared; however, no processing is required since the counter is already set to
“0000H”.
Write “12H” in RADMOD to select Counter B reference mode and the oscillation mode that uses thermistor RT0.
Write “01H” in RADCON to start A/D conversion operation.
Write “1” in the HLT bit of SBYCON to set the device to HALT mode.
Calculate “10000H – nB0” from the content of Counter B “nB0” and set the obtained value in Counter B.
RCCLK
(RS0)
(RT0)
=
=
=
=
(RS0) is the oscillator clock period by reference resistor RS0 and t
nA0•
nB0•
nA0•
nA0•
=
=
k
k
RCCLK
RCCLK
t
t
t
t
RCCLK
RCCLK
RCCLK
RCCLK
t
t
•(CS0+CVR)•RS0
•(CS0+CVR)•RT0
RS0
BSCLK
BSCLK
RT0
(RS0)
(RT0)
(RT0)
(RS0)
RCCLK
... Expression B
... Expression C
... Expression D
... Expression E
= k
21-17
RCCLK
ML610Q407/ML610Q408/ML610Q409 User's Manual
x R x C", t
Chapter 21 RC Oscillation Type A/D Converter
RCCLK
(RS0) and t
RCCLK
RCCLK
(RT0) the oscillator clock period
(RT0) using RT0.
RCCLK
(RT0) are expressed by