Register Configuration; Register Descriptions; Flash Memory Control Register 1 (Flmcr1) - Hitachi H8S/2646 Hardware Manual

Hitachi 16-bit single-chip microcomputer h8s/2646 series

Table of Contents

Register Configuration

The registers used to control the on-chip flash memory when enabled are shown in table 20-2.

Table 20-2 Register Configuration

Flash memory control register 1

Flash memory control register 2

Erase block register 1

Erase block register 2

RAM emulation register

Flash memory power control register FLPWCR

Notes: *1 Lower 16 bits of the address.

*2 When a high level is input to the FWE pin, the initial value is H'80.

*3 When a low level is input to the FWE pin, or if a high level is input and the SWE bit in

FLMCR1 is not set, these registers are initialized to H'00.

*4 FLMCR1, FLMCR2, EBR1, EBR2, RAMER, and FLPWCR are 8-bit registers.

Use byte access on these registers.

FLMCR1 is an 8-bit register used for flash memory operating mode control. Program-verify mode

or erase-verify mode for addresses H'00000 to H'1FFFF is entered by setting SWE bit to 1 when

FWE = 1, then setting the PV or EV bit. Program mode for addresses H'00000 to H'1FFFF is

entered by setting SWE bit to 1 when FWE = 1, then setting the PSU bit, and finally setting the P

bit. Erase mode for addresses H'00000 to H'1FFFF is entered by setting SWE bit 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 are enabled only in the following cases: Writes to bit SWE of FLMCR1 enabled when

FWE = 1, to bits ESU, PSU, EV, and PV when FWE = 1 and SWE = 1, to bit E when FWE = 1,

SWE = 1 and ESU = 1, and to bit P when FWE = 1, SWE = 1, and PSU = 1.

Abbreviation

Initial Value