HD64F38024DV Renesas Electronics America, HD64F38024DV Datasheet - Page 448

• Manufacturer Part Number: HD64F38024DV
• Description: IC H8/SLP MCU FLASH 80QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300L SLPr

Specifications of HD64F38024DV

• Core Processor: H8/300L
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: SCI
• Peripherals: LCD, PWM, WDT
• Number Of I /o: 51
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

float atan2f(float y, float x)
Description:
Header file:
Return values:
Example:
Error conditions:
Remarks:
434
Parameters:
Computes the arc tangent of the division of two floating-point numbers.
Abnormal:
A domain error occurs if the values of both x and y are 0.0.
<mathf.h>
Normal:
x
The atan2f function returns the arc tangent in the range (– , ] by the radian.
The meaning of the atan2f function is illustrated in figure 10.6. As shown in the
figure, the result of the atan2f function is the angle between the X-axis and a
straight line passing through the origin and point (x, y).
depending on whether y is positive or negative.
y
#include <mathf.h>
float x, y, ret;
If y = 0.0 and x is negative, the result is . If x = 0.0, the result is ± /2,
ret=atan2f(y, x);
Figure 10.6 Meaning of atan2f Function
In case of domain error: Returns not-a-number.
Dividend
Arc tangent value when y is divided by x
Divisor
y
Y
(x, y)
x
atan2f (y, x)
X