Chapter 6 Cautions; Cautions When On-Chip Debug - Renesas QB-78K0KX1H-DA User Manual

On-chip debug emulator

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Table of Contents

6.1 Cautions When On-chip Debug

(1) Reserved area used by QB-78K0MINI

The following reserved areas are used by QB-78K0MINI.

(a) Flash memory area

Addresses 0x02 and 0x03

Addresses 0x7E and 0x7F (when using a software break)

Address 0x84

Addresses 0x85 to 0x8E

Addresses 0x8F to 0x18F: Standard value of program

(+256 bytes when using pseudo real-time RAM monitor function)

(when using a device with 10 or more SFRs the can be accessed in 16-bit units: +n (the number of

exceeding registers x 6 bytes))

(b) Internal extended RAM area

Addresses 0xF7F0 to 0xF7FF

(when using pseudo real-time RAM monitor function)

7 bytes as stack area: Standard value of stack

(+2 bytes when using software breaks)

(+7 bytes when using pseudo real-time RAM monitor function)

(2) Values at addresses 0x02, 0x03 and 0x8F or higher

Values other than 0xFF cannot be downloaded to address 0x02, 0x03 or the program area starting from address

0x8F. 0xFF is always displayed in the Memory window in order to prevent errors that occur by changing the

value. Uploaded data is also displayed as 0xFF. In addition, on-chip debugging cannot be performed on these

areas after they are overwritten by self programming.

(3) Values specified by linker option -go

Among the reserved areas used by QB-78K0MINI, the following areas can be secured using the linker option -go.

Addresses 0x02 and 0x03

(Size of program specified from address 0x8F) +1

Specify the -go option default value, 256, for the program size for on-chip debugging.

Standard

When using the pseudo real-time RAM monitor function, expand the program area by 256 bytes. When using a

device with 10 or more SFRs that can be accessed in 16-bit units, expand the program area for on-chip

debugging (default: 257 bytes of 0x8F to 0x18F) by the amount exceeding the 10-SFR area. As a rough guide,

add the number of exceeding registers x 6 bytes.

Specify the size of the program area as "default size (257 bytes) + (the number of exceeding registers x 6 bytes)

with the linker option.

The value specified by the option may change when the function is extended in future.