HD64F38024DV Renesas Electronics America, HD64F38024DV Datasheet - Page 963

• 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: -

Example:
int a;
f() {
}
In Ver. 6.01, optimization is further performed in the cases below.
To disable the optimization, declare the relevant variable with volatile.
Example 1:
int a;
f() {
}
In this example, while statement (2) has become an infinite loop as a result of optimization.
Due to alias analysis of the pointer, *ptr in (1) and *ptr in (2) are handled as the same value.
Expression (1) is propagated to expression (2). Accordingly, expression (2) is converted as
follows:
-> while(!(*ptr & 0))
-> while(!(0))
-> while(1)
Therefore, the expression in question is judged as true, the judge statement is eliminated,
and the above while statement becomes an infinite loop.
int *ptr=&a;
*ptr=1;
*ptr=2;
int *ptr=&a;
*ptr &= ~( (0x0080) );
while( !( *ptr & (0x0080) ) )
}
}
while( !( (*ptr & ~( (0x0080) )) & (0x0080) ) )
:
//
<- Only this assignment expression is eliminated.
//
//
<- (1)
<- (2)
//
<- (2)
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