h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 687

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

22.5
22.5.1
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. Program mode is entered by setting SWE to
1, then setting the PSU bit in FLMCR2, and finally setting the P bit. Erase mode is entered by
setting SWE to 1, then setting the ESU bit in FLMCR2, and finally setting the E bit. FLMCR1 is
initialized to H'80 by a reset, and in hardware standby mode, software standby mode, subactive
mode, subsleep mode, and watch mode. When on-chip flash memory is disabled, a read will return
H'00, and writes are invalid.
Writes to the EV and PV bits in FLMCR1 are enabled only when SWE=1; writes to the E bit only
when SWE = 1, and ESU = 1; and writes to the P bit only when SWE = 1, and PSU = 1.
Bit 7—Flash Write Enable (FWE): Sets hardware protection against flash memory
programming/erasing. This bit cannot be modified and is always read as 1.
Bit 6—Software Write Enable (SWE): Enables or disables flash memory programming. SWE
should be set before setting bits ESU, PSU, EV, PV, E, P, and EB7 to EB0, and should not be
cleared at the same time as these bits.
Bit 5 and 4—Reserved: These bits cannot be modified and are always read as 0.
Bit 6
SWE
0
1
Bit
Initial value
Read/Write
Register Descriptions
Flash Memory Control Register 1 (FLMCR1)
Description
Writes disabled
Writes enabled
Section 22 ROM
FWE
R
7
1
SWE
R/W
6
0
(H8S/2138 F-ZTAT A-Mask Version, H8S/2134 F-ZTAT A-Mask Version)
—
—
5
0
—
—
4
0
Rev. 4.00 Jun 06, 2006 page 633 of 1004
R/W
EV
3
0
R/W
PV
2
0
REJ09B0301-0400
R/W
E
1
0
(Initial value)
R/W
P
0
0