HD64F2168 Datasheet, PDF (670/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

(1) Download Control
The on-chip program is automatically downloaded by setting the SCO bit to 1. The on-chip RAM
area to be downloaded is the 2-kbyte area starting from the address specified by FTDAR.
Download control is set by the program/erase interface registers, and the DPFR parameter
indicates the return value.
(a) Download pass/fail result parameter (DPFR: single byte of start address specified by FTDAR)
This parameter indicates the return value of the download result. The value of this parameter can
be used to determine if downloading is executed or not. Since the confirmation whether the SCO
bit is set to 1 is difficult, the certain determination must be performed by writing the single byte of
the start address specified by FTDAR to the value other than the return value of download (for
example, H'FF) before the download start (before setting the SCO bit to 1).
Initial
Bit
Bit Name Value R/W Description
7 to 3 


Unused
Return 0
2
SS

R/W Source Select Error Detect
Only one type for the on-chip program which can be
downloaded can be specified. When more than two
types of the program are selected, the program is not
selected, or the program is selected without mapping,
error is occurred.
0: Download program can be selected normally
1: Download error is occurred (multi-selection or
program which is not mapped is selected)
1
FK

R/W Flash Key Register Error Detect
Returns the check result whether the value of FKEY is
set to H′A5.
0: KEY setting is normal (FKEY = H'A5)
1: Setting value of FKEY becomes error (FKEY = value
other than H'A5)
0
SF

R/W Success/Fail
Returns the result whether download is ended normally
or not. The determination result whether program that is
downloaded to the on-chip RAM is read back and then
transferred to the on-chip RAM is returned.
0: Downloading on-chip program is ended normally (no
error)
1: Downloading on-chip program is ended abnormally
(error occurs)
Rev. 3.00, 03/04, page 630 of 830