TMP89FS60 datasheet(326/410 Pages) TOSHIBA

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21. Flash Memory

TMP89FS60

RA003

To access the flash memory again after setting FLSSTB<FSTB> to "1", set FLSSTB<FSTB> to "0" by using

a program allocated to RAM. If the flash memory is accessed with FLSSTB<FSTB> set to "1," a flash standby

reset will occur.

If an interrupt occurs when the interrupt vector is assigned to the flash memory area (SYSCR3<RVCTR> =

"0" is effective), FSTB is automatically initialized to "0", and then the interrupt vector of the flash memory

area is read. If an interrupt occurs when the interrupt vector is assigned to the RAM area (SYSCR3<RVCTR>

= "1" is effective), FSTB is not cleared to "0", and then the interrupt vector of the RAM area is read. In this

case, the RAM area should be designated as a referential address of interrupt vector. If the flash memory area is

designated as a referential address of interrupt vector, a flash standby reset occurs after an interrupt is gener-

ated.

Operations performed by controlling the FLSSTB register are described below

(1 and 2 show the operations performed by a program residing in the flash memory, and 3 through 8 show the

operations performed by a program transferred to RAM):

1. Transferring a control program of the FLSSTB register to RAM

2. Invoking a program in the RAM area

3. Disabling (DI) the interrupt master enable flag (IMF

← "0")

4. Setting FLSSTB<FSTB> to "1"

5. Executing a user program

6. Repeatedly performing the operation described in 5 above until the request to return to the flash mem-

ory is detected

7. Setting FLSSTB<FSTB> to "0"

8. Returning to the flash memory area

21.2.6 Port input control register (SPCR<PIN0, PIN1>)

In serial PROM mode, the input levels of all ports, except the ports RXD0 and TXD0 used in serial PROM

mode, are physically fixed after a reset is released. This is designed to prevent a penetration current from flow-

ing through unused ports (port inputs and functional peripheral inputs, which are also used as ports, are dis-

Example: Case in which FLSSTB is configured in the RAM area

cRAMStartAdd

equ 0x0200

; Start address of RAM

main section code abs = 0x1000

; #### Operation for transferring a program to RAM #### (STEP1)

HL,cRAMStartAdd

IX,sRAMprogStart

sRAMLOOP:

A,(IX)

; Transferring a program from sRAMprogStart to

(HL),A

; sRAMprogEnd to cRAMStartAdd

INC

CMP

IX,sRAMprogEnd

JNZ,sRAMLOOP

CALL

cRAMStartAdd

; Call the RAM program (step 2)

; Executing a user program

JXXXX

; #### Program executed in RAM ####

sRAMprogStart:

; Interrupt disable (step 3)

(FLSSTB),0x01

; FSTB="1" (step 4)

; Executing a user program (step 5)

(FLSSTB),0x00

; FSTB="0" (step 7)

RET

; Returning to the flash memory area (step 8)

sRAMprogEnd

NOP

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