UPD70F3740GC-UEU-AX Renesas Electronics America, UPD70F3740GC-UEU-AX Datasheet - Page 280

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UPD70F3740GC-UEU-AX

Manufacturer Part Number
UPD70F3740GC-UEU-AX
Description
MCU 32BIT V850ES/JX3 100-LQFP
Manufacturer
Renesas Electronics America
Series
V850ES/Jx3r
Datasheet

Specifications of UPD70F3740GC-UEU-AX

Core Processor
RISC
Core Size
32-Bit
Speed
32MHz
Connectivity
CSI, EBI/EMI, I²C, UART/USART
Peripherals
DMA, LVD, PWM, WDT
Number Of I /o
84
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Ram Size
40K x 8
Voltage - Supply (vcc/vdd)
2.85 V ~ 3.6 V
Data Converters
A/D 12x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-

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V850ES/JG3
R01UH0015EJ0300 Rev.3.00
Sep 30, 2010
(d) Processing of overflow if capture trigger interval is long
If the pulse width is greater than one cycle of the 16-bit counter, care must be exercised because an overflow
may occur more than once from the first capture trigger to the next. First, an example of incorrect processing is
shown below.
The following problem may occur when long pulse width is measured in the free-running timer mode.
<1> Read the TPnCCRm register (setting of the default value of the TIPnm pin input).
<2> An overflow occurs. Nothing is done by software.
<3> An overflow occurs a second time. Nothing is done by software.
<4> Read the TPnCCRm register.
If an overflow occurs twice or more when the capture trigger interval is long, the correct pulse width may not be
obtained.
If the capture trigger interval is long, slow the count clock to lengthen one cycle of the 16-bit counter, or use
software. An example of how to use software is shown next.
TPnCCRm register
Read the overflow flag. If the overflow flag is 1, clear it to 0.
Because the overflow flag is 1, the pulse width can be calculated by (10000H + D
(incorrect).
Actually, the pulse width must be (20000H + D
INTTPnOV signal
TIPnm pin input
16-bit counter
TPnOVF bit
Example of incorrect processing when capture trigger interval is long
TPnCE bit
FFFFH
0000H
CHAPTRER 7 16-BIT TIMER/EVENT COUNTER P (TMP)
D
m0
<1> <2>
m1
− D
m0
1 cycle of 16-bit counter
) because an overflow occurs twice.
Pulse width
D
m0
<3> <4>
D
m1
D
m1
Page 264 of 870
m1
− D
m0
)

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