Page 320
21. Flash Memory
21.4 Toggle Bit (D6)
TMP89FM42
RA003
Note 1: In using a write instruction in the xxx bus write cycle, make sure that you use a write instruction of
more than three machine cycles or arrange write instructions in such a way that they are generated at
intervals of three or more machine cycles. If a 16-bit transfer instruction is used or if write instructions
are executed at intervals of two machine cycles, the flash memory command sequence will not be
transmitted properly, and a malfunction may occur.
Note 2: If a read of the flash memory (toggle operation) is to be performed after a write instruction is gener-
ated in the xth bus write cycle, instructions must be arranged in such a way that they are generated at
intervals of three or more machine cycles; machine cycles are counted from when the last xth bus
write cycle is generated to when each instruction is generated. Three NOP instructions are normally
used. If the interval between instructions is short, the toggle bit does not operation correctly.
sLOOP1:
LD
A,(IX)
; (steps 8,14)
CMP
A,(IX)
J
NZ,sLOOP1
; Loop until the read values become the same
LD
(FLSCR1),0x40
; Disable the execution of command sequence (steps 9 and
15)
LD
(FLSCR2),0xD5
; Reflect the FLSCR1 setting
RET
; Return to flash memory
; Address conversion process (steps 6 and 12)
sAddConv:
LD
WA,IX
SWAP
C
AND
C,0x10
SWAP
W
AND
W,0x08
OR
C,W
XOR
C,0x08
SHRC
C
OR
C,0xA0
LD
(FLSCR1),C
; Enable the execution of command sequence. Make the
FAREA setting.
LD
(FLSCR2),0xD5
; Reflect the FLSCR1 setting
LD
WA,IX
TEST
C.3
J
Z,sAddConvEnd
OR
W,0x80
LD
IX,WA
sAddConvEnd:
RET
; Interrupt subroutine
sINTWDT:
:
:
; Error processing
RETN
sINTSWI:
:
:
; Error processing
RETN
sRAMprogEnd:
NOP
Example: Case in which data is read from 0xF000 in the code area and stored at 0x98 in RAM
LD
(FLSCR1),0xA8
; Select AREA C1
LD
(FLSCR2),0xD5
; Reflect the FLSCR1 setting
LD
A,(0xF000)
; Read data from 0xF000
LD
(0x98),A
; Store data at 0x98
LD
(FLSCR1),0x40
; Select AREA D0
LD
(FLSCR2),0xD5
; Reflect the FLSCR1 setting
Summary of Contents for TLCS-870/C1 Series
Page 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......