HD64F38024DV Renesas Electronics America, HD64F38024DV Datasheet - Page 288

• 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: -

(5) On the precision of mathematical library functions
(6) Writing to const type variables
(7) Note on bit manipulation instructions
274
The error in the acos(x) and asin(x) functions is great when x 1; care should be taken when
using these functions. The error range is as follows.
Absolute error at double precision in acos(1.0- ) 2
Absolute error at double precision in asin(1.0- ) 2
Keep the following in mind. If a variable declared as const is converted to a type that is not
const via type conversion, or if types are not consistent among files compiled separately, then
the compiler cannot check for writing to a const type variable.
Examples:
This compiler generates the bit manipulation instructions BSET, BCLR, BNOT, BST, and
BIST. These instructions read data in byte units, and after bit manipulation write data in byte
units again. On the other hand, if a write-only register is read, the CPU retrieves an undefined
value, regardless of the register contents. Hence in bit manipulation instructions for a write-
only register, bits other than the bit to be manipulated may change. The following is an
example of bit manipulation for a write-only register.
At single precision 2
At single precision 2
[1] const char *p;
[2] File 1
strcat(p,”abc”);
File 2
extern int i;
const int i;
i=10;
:
:
-21
-21
( = 2
( = 2
/* The first parameter of the library function strcat is */
/* a pointer to a char type, and so the area indicated
/* by the parameter may be overwritten.
/* The variable i is not declared as const type in File 2. */
/* No error is detected against update of i. */
-19
-16
)
)
-39
-39
( = 2
( = 2
-28
-33
)
)
*/
*/