M16C29 Datasheet, PDF (371/499 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/Tiny SERIES

M16C/29 Group
20. Flash Memory Version
20.7 Software Commands
Read or write 16-bit commands and data from or to even addresses in the user ROM area. When writing a
command code, 8 high-order bits (D15–D8) are ignored.
Table 20.5 Software Commands
Command
Read array
Read status register
Clear status register
Program
Block erase
Mode
Write
Write
Write
Write
Write
First bus cycle
Data
Address _{(D15 to D0)}
X
xxFF16
X
xx7016
X
xx5016
WA
xx4016
X
xx2016
SRD: Status register data (D7 to D0)
WA : Write address (However,even address)
WD : Write data (16 bits)
BA : Highest-order block address (However,even address)
X : Any even address in the user ROM area
xx : 8 high-order bits of command code (ignored)
Second bus cycle
Mode
Address
Data
(D15 to D0)
Read
X
SRD
Write
Write
WA
WD
BA
xxD016
20.7.1 Read Array Command (FF16)
The read array command reads the flash memory.
Read array mode is entered by writing command code xxFF16 in the first bus cycle. Content of a speci-
fied address can be read in 16-bit unit after the next bus cycle. The MCU remains in read array mode until
an another command is written. Therefore, contents of multiple addresses can be read consecutively.
20.7.2 Read Status Register Command (7016)
The read status register command reads the status register.
By writing command code xx7016 in the first bus cycle, the status register can be read in the second bus
cycle (Refer to 20.8 Status Register). Read an even address in the user ROM area. Do not execute this
command in EW mode 1.
20.7.3 Clear Status Register Command (5016)
The clear status register command clears the status register to 0.
By writing xx5016 in the first bus cycle, and bits FMR06 to FMR07 in the FMR0 register and bits SR4 to
SR5 in the status register are set to 0.
Rev. 1.12 Mar.30, 2007 ^{page 347} of 458
REJ09B0101-0112