HD6432621 Hitachi, HD6432621 Datasheet - Page 668

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Writes are enabled only in the following cases: Writes to bit SWE1 of FLMCR1 enabled when
FWE = 1, to bits ESU1, PSU1, EV1, and PV1 when FWE = 1 and SWE1 = 1, to bit E1 when
FWE = 1, SWE1 = 1 and ESU1 = 1, and to bit P1 when FWE = 1, SWE1 = 1, and PSU1 = 1.
Note: * Determined by the state of the FWE pin.
Bit 7—Flash Write Enable Bit (FWE): Sets hardware protection against flash memory
programming/erasing.
Bit 7: FWE
0
1
Bit 6—Software Write Enable Bit 1 (SWE1): This bit selects write and erase valid/invalid of the
flash memory. Set it when setting bits 5 to 0, bits 7 to 0 of EBR1, and bits 3 to 0 of EBR2.
Bit 6: SWE1
0
1
Bit 5—Erase Setup Bit 1 (ESU1): Prepares for a transition to erase mode. Set this bit to 1 before
setting the E1 bit in FLMCR1 to 1. Do not set the SWE1, PSU1, EV1, PV1, E1, or P1 bit at the
same time.
Bit 5: ESU1 Description
0
1
Bit 4—Program Setup Bit 1 (PSU1): Prepares for a transition to program mode. Set this bit to 1
before setting the P1 bit in FLMCR1 to 1. Do not set the SWE1, ESU1, EV1, PV1, E1, or P1 bit
at the same time.
624
Initial value:
R/W:
Description
When a low level is input to the FWE pin (hardware-protected state)
When a high level is input to the FWE pin
Erase setup cleared
Erase setup
[Setting condition]
When FWE = 1 and SWE1 = 1
Bit:
Description
Writes disabled
Writes enabled
[Setting condition]
When FWE = 1
FWE
—*
7
R
SWE1
R/W
6
0
ESU1
R/W
5
0
PSU1
R/W
4
0
EV1
R/W
3
0
PV1
R/W
2
0
R/W
E1
1
0
(Initial value)
(Initial value)
R/W
P1
0
0