SH7018 datasheet(340/431 Pages) RENESAS

340 / 431 page

324

16.5

16.5.1

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 is entered by setting SWE to 1 when FWE = 1. Program mode is entered by

setting SWE to 1 when FWE = 1, then setting the PSU bit, and finally setting the P bit. Erase

mode is entered by setting SWE to 1 when FWE = 1, then setting the ESU bit, and finally setting

the E bit. FLMCR1 is initialized by a power-on reset, and in standby mode. 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'00, and writes are invalid.

Writes to bits SWE, ESU, PSU, EV, and PV are enabled only when FWE = 1 and SWE = 1; writes

to the E bit only when FWE = 1, SWE = 1, and ESU = 1; and writes to the P bit only when FWE =

1, SWE = 1, and PSU = 1.

Bit:

FWE

SWE

ESU

PSU

Initial value:

1/0

R/W:

R/W

• Bit 7—Flash Write Enable Bit (FWE): Sets hardware protection against flash memory

programming/erasing.

Bit 7:

FWE

Description

When a high level is input to the FWP pin (hardware-protected state)

(Initial value)

When a 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 before setting bits 5 to 0, EBR1 bits 7 to 0, and EBR2 bits 2 to 0. The flash

memory cannot be read when SWE is set to 1, except in the program verify/erase verify mode.

Bit 6:

SWE

Description

Writes disabled

(Initial value)

Writes enabled

[Setting condition]

When FWE = 1

SH7018 Datasheet(PDF) 340 Page - Renesas Technology Corp

SH7018 Datasheet(HTML) 340 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL