User guide

SmartBook for Renesas R8C/Tiny Microcontrollers

www.MightyMicons.com

Following is the address scheme for the memory organization. As you can see,

the RAM area is made available at the lower end. Initial memory space, up to

02FFH is allotted for the Special Function Registers (SFR). SFR maintains all the

peripheral functions’ control registers and other registers meant for flash

programming and system management. Then the RAM area starts at 0400H and

expands upwards. The flash or program memory starts from 0FFFFH and grows

downwards. More than 64K byte is considered as expanded memory.

Now, we take up in system programming again for the discussion. The

microcontrollers come with the boot program to manage programming

operations. When this boot program is activated, the entire

flash area can be erased and then be reprogrammed using

a host computer. The boot program synchronizes the

microcontroller with the computer automatically

during data transfer operations. Apart form this

bulk erase and programming, the devices

support in system programming. You can

reprogram the contents of the flash memory

in two modes.

For this, the controller comes with built

in programming sequences. When the

When

the first mode

(E/W=0) is selected, the

built in programming kernel

is transferred to the RAM area

and then the program control is

shifted to this

kernel. Without

stopping the CPU,

any portion of the

flash memory can be

reprogrammed.