SH7050 Datasheet, PDF (615/841 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH RISC engine Family/

19.5 Register Descriptions
Section 19 ROM (256 kB Version)
19.5.1 Flash Memory Control Register 1 (FLMCR1)
FLMCR1 is an 8-bit register used for flash memory operating mode control. Program-verify mode
or erase-verify mode for addresses H'00000 to H'1FFFF is entered by setting SWE to 1 when FWE
= 1, then setting the EV1 or PV1 bit. Program mode for addresses H'00000 to H'1FFFF is entered
by setting SWE to 1 when FWE = 1, then setting the PSU1 bit, and finally setting the P1 bit. Erase
mode for addresses H'00000 to H'1FFFF is entered by setting SWE to 1 when FWE = 1, then
setting the ESU1 bit, and finally setting the E1 bit. FLMCR1 is initialized by a reset, and in
hardware standby mode and software standby mode. Its initial value is H'80 when a high level is
input to the FWE pin, and H'00 when a low level is input. When on-chip flash memory is disabled,
a read will return H'00, and writes are invalid.
Writes to bits SWE, ESU1, PSU1, EV1, and PV1 in FLMCR1 are enabled only when FWE = 1
and SWE = 1; writes to the E1 bit only when FWE = 1, SWE = 1, and ESU1 = 1; and writes to the
P1 bit only when FWE = 1, SWE = 1, and PSU1 = 1.
Bit: 7
6
5
4
3
2
1
0
FWE SWE ESU1 PSU1 EV1 PV1
E1
P1
Initial value: 1/0
0
0
0
0
0
0
0
R/W: R
R/W R/W R/W R/W R/W R/W R/W
Bit 7—Flash Write Enable Bit (FWE): Sets hardware protection against flash memory
programming/erasing.
Bit 7:
FWE
0
1
Description
When a low level is input to the FWE pin (hardware-protected state)
When a high level is input to the FWE pin
Rev. 5.00 Jan 06, 2006 page 595 of 818
REJ09B0273-0500