INTERNAL MEMORY
6.5 Programming the Internal Flash Memory
6
6.5.2 Controlling Operation Modes during Flash Programming
The microcomputer’s operation mode is set by MOD0, MOD1 and Flash Control Register 1 (FCNT1) FENTRY
bit. The table below lists operation modes that may be used when programming or erasing the internal flash
memory.
Table 6.5.1 Operation Modes Set during Flash Programming/Erase
FP
MOD0 MOD1 FENTRY (Note 1) Operation Mode
Reset Vector Entry
EI Vector Entry
Flash area
0
0
0
0
0
0
0
Single-chip mode
Start address of internal
1
flash memory
(H'0000 0000)
(H'0000 0080)
0
1
0
0
Processor mode
Start address of external
area
External area
(H'0000 0000)
(H'0000 0080)
Flash area
0
1
0
0
1
1
0
0
External extension
mode
Start address of internal
flash memory
(H'0000 0000)
(H'0000 0080)
1
0
0
1
Single-chip mode
+ flash E/W enable
Start address of internal
flash memory
Beginning of internal RAM
(H'0080 4000)
(H'0000 0000)
1
1
1
1
1
0
0
0
1
0
1
1
Boot mode
Boot program starts
running
Flash area
(H'0000 0080)
Boot mode + flash
E/W enable
Boot program starts
running
Beginning of internal RAM
(H'0080 4000)
External extension
mode + flash E/W
enable
Start address of internal
flash memory
Beginning of internal RAM
(H'0080 4000)
(H'0000 0000)
–
1
1
–
Use inhibited
–
–
Note 1: Indicates the Flash Control Register 1 (FCNT1) FENTRY bit status (– denotes “Don’t care”). However, if FP = "0",
writing "1" to FENTRY only results in it cleared to "0".
(1) Flash E/W enable mode
Flash E/W enable mode is a mode in which the internal flash memory can be programmed or erased. In flash
E/W enable mode, no programs can be executed in the internal flash memory. Therefore, the necessary
program must be transferred into the internal RAM before entering flash E/W enable mode, so that it can be
executed in the RAM.
(2) Entering flash E/W enable mode
Flash E/W enable mode can only be entered when operating in single-chip, external extension or boot mode.
Furthermore, it is only when the FP pin = "high" and the Flash Control Register 1 (FCNT1) FENTRY bit = "1"
that flash E/W enable mode can be entered. Flash E/W enable mode cannot be entered when operating in
processor mode or the FP pin = "low".
(3) Detecting the MOD0 and MOD1 pin levels
The MOD0 and MOD1 pin levels ("high" or "low") can be known by checking the P8 Data Register (Port Data
Register, H’0080 0708) MOD0DT and MOD1DT bits.
32180 Group User’s Manual (Rev.1.0)
6-17
RENESAS [ RENESAS TECHNOLOGY CORP ]
