SH7040 Datasheet, PDF (728/923 Pages) Renesas Technology Corp – Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

22.5 Description of Registers
22.5.1 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–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–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–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 in the standby mode or with
power-on reset. Its initial value is H'80 when a low level is input to the FWP pin, and H'00 when a
high level is input. When on-chip flash memory is disabled, a read will return H'80, and writes are
invalid.
Writes to bits SWE, ESU1, PSU1, EV1, and PV1 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: 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): Displays the state of the FWP pin which sets hardware
protection against flash memory programming/erasing.
Bit 7: FWE
0
1
Description
When high level is input to the FWP pin (hardware-protect state)
When low level is input to the FWP pin
• Bit 6—Software Write Enable Bit (SWE): Enables or disables the flash memory. This bit
should be set when setting bits 5–0, FLMCR2 bits 5–0, EBR1 bits 3–0, and EBR2 bits 7–0.
Bit 6: SWE
0
1
Description
Writes disabled
Writes enabled
[Setting condition] When FWE=1
(Initial value)
• Bit 5—Erase Setup Bit 1 (ESU1): Prepares for a transition to erase mode (applicable
addresses: H'00000–H'1FFFF). Do not set the SWE, PSU1, EV1, PV1, E1, or P1 bit at the
same time.
690