HD64F38024DV Renesas Electronics America, HD64F38024DV Datasheet - Page 215

• 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: -

Table 9.2 Example of Calculation of Stack Area Used
Calling Path
main (18)
main (18)
Note on stack consumption calculation
f ( )
In this way, the stack area used is calculated for the function at the deepest calling level,
and stack area for this maximum value (in this case, 74 bytes) is allocated.
The fundamental to calculate the amount of stack consumption differs between Ver. 4.0 or
earlier or Ver. 6.0 except for H8SX and H8SX of Ver. 6.0. In this note, Ver. 4.0 or earlier
and Ver 6.0 except for H8SX is called the group A, and H8SX of Ver. 6.0 and H8S or
H8SX of Ver. 6.01 is called the group B. Take care if a function compiled by the group A
calls a function compiled by the group B, and vice versa.
The behavior of the SP, the stack pointer, differs between the group A and B. In the group
A, a parameter passed via the stack is stored after decrementing the SP using the push
instruction or the pre-decrement addressing mode (@-SP) as shown at [1] of the following
example. After the return from the function call, the stack area for the parameter is released
through incrementing the SP by the parameter size as shown at [2] of the following
example. In group A, the size of the parameter area in the stack differs depending on a
function, and that size is counted into the Parameter Area Size of the callee’s stack frame
size as shown at [3] of the following example.
Figure 9.5 Example of Function Calling Relationships and Stack Area Used
f (32)
g(24)
main ( )
g(24)
74
42
Stack Area Used
g ( )
Function Name
main
g
f
Remarks
Stack space used
(maximum)
Stack Size (Bytes)
18
24
32
201