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17.5
Register Descriptions
17.5.1
Flash Memory Control Register 1 (FLMCR1)
Bit
:
7
FWE
Initial value :
1/0
R/W
:
R
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, then setting the EV or PV bit.
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 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 the SWE bit in FLMCR1 are enabled only when FWE = 1; writes to bits ESU, PSU, EV,
and PV 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 7—Flash Write Enable Bit (FWE): Sets hardware protection against flash memory
programming/erasing.
Bit 7
FWE
Description
0
When a low level is input to the FWE pin (hardware-protected state)
1
When a high level is input to the FWE pin
Bit 6—Software Write Enable Bit (SWE): Enables or disables flash memory programming and
erasing. This bit should be set when setting FLMCR1 bits 5 to 0, EBR1 bits 7 to 0, and EBR2 bits
3 to 0 * .
When SWE = 1, the flash memory can only be read in program-verify or erase-verify mode.
Note: * EBR2 bits 5 to 0 should be set in the H8S/2315 F-ZTAT and H8S/2314 F-ZTAT.
Bits 1, 0 should be set in the H8S/2317 F-ZTAT.
6
5
SWE
ESU
0
0
R/W
R/W
4
3
PSU
EV
0
0
R/W
R/W
R/W
Rev. 5.00, 12/03, page 567 of 1088
2
1
PV
E
0
0
R/W
R/W
0
P
0
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