HD64F38024DV Renesas Electronics America, HD64F38024DV Datasheet - Page 263

• 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: -

(4) Rules concerning settings and referencing parameters and return values
(c) Calling a C++ program subroutine from an assembly program
Below the method for setting and referencing parameters and return values is explained. Rules
for parameters and return values differ depending on whether, in the function declaration, the
type of each parameter and of the return value has been declared explicitly or not. In order to
make explicit declarations of the types of parameters and the return value, a function prototype
declaration is used.
In the following explanation, first general rules for parameters and return values are described;
then, assignment of parameters and the location for setting the return value are discussed.
(a) General rules for parameters and return values
C++ program (called function)
Assembly program (calling function)
registers or to
Note: Functions declared using extern "C" cannot be overloaded.
extern "C"
void sub(void)
{
}
Passing parameters
The values of parameters must always be copied to the area allocated to parameters
before calling the function. The calling function does not reference the area allocated to
parameters after return, and so the called function can change the parameter values with
no direct effect on processing by the calling function.
Rules for type conversion:
When passing parameters or returning a value, in some cases automatic type
conversions are performed. Below the rules for these type conversions are explained.
…
.IMPORT
.SECTION P,CODE,ALIGN=2
MOV.L
MOV.L
JSR
RTS
.END
Type conversion of return values:
Return values are converted into the type returned by the function.
:
ER1,@(4,SP)
ER0,ER6
@_sub
_sub
:
If there are valid values in registers ER0,
ER1, they are saved by the caller to unused
resisters or to the stack
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