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2. CPU Core
2.2 Memory space
TMP89FM42
RA001
2.2.1.1
RAM
The RAM is mapped in the data area immediately after reset release.
By setting SYSCR3<RAREA> to "1" and writing 0xD4 to SYSCR4, RAM can be mapped to 0x0040to
0x083F in the code area to execute the program.
At this time, by setting SYSCR<RVCTR> to "1" and writing 0xD4 to SYSCR4, vector table for vector
call instructions and interrupt except reset can be mapped to RAM.
Note 1: The value of SYSCR3<RAREA> is invalid until 0xD4 is written into SYSCR4.
Note 2: To assign vector address areas to RAM, set SYSCR3<RVCTR> to "1" and SYSCR3<RAREA> to "1".
Note 3: Do not set SYSCR3<RVCTR> to "0" by using the RAM loader program. If an interrupt occurs with SYSCR3<RVCTR> set
to "0", the BOOTROM area is referenced as a vector address and, therefore, the program will not function properly.
Note 4: Bits 7 to 3 of SYSCR3 are read as "0".
Note 1: SYSCR4 is a write-only register, and must not be accessed by using a read-modify-write instruction, such as a bit opera-
tion.
Note 2: After SYSCR3<RSTDIS> is modified, SYSCR4 should be written 0xB2 (Enable code for SYSCR3<RSTDIS>) in NORMAL
mode when fcgck is fc/4 (CGCR<FCGCKSEL>=00). Otherwise, SYSCR3<RSTDIS> may be enabled at unexpected tim-
ing.
Note 3: After IRSTSR<FCLR> is modified, SYSCR4 should be written 0x71 (Enable code for IRSTSR<FCLR> in NORMAL mode
when fcgck is fc/4 (CGCR<FCGCKSEL>=00). Otherwise, IRSTSR<FCLR> may be enabled at unexpected timing.
In the serial PROM mode, the RAM is mapped to 0x0040 to 0x083F in the code area, regardless of the
value of SYSCR3<RAREA>. The program can be executed on the RAM using the RAM loader function.
Note 1: When the RAM is not mapped in the code area, the SWI instruction is fetched from 0x0040 to 0x083F.
Note2:
The contents of the RAM become unstable when the power is turned on and immediately after a reset
is released. To execute the program by using the RAM, transfer the program to be executed in the
initialization routine.
System control register 3
SYSCR3
(0x0FDE)
7
6
5
4
3
2
1
0
Bit Symbol
-
-
-
-
-
RVCTR
RAREA
(RSTDIS)
Read/Write
R
R
R
R
R
R/W
R/W
R/W
After reset
0
0
0
0
0
0
0
0
RAREA
Specifies mapping of the RAM in
the code area
0 :
The RAM is not mapped from 0x0040 to 0x083F in the code area.
1 :
The RAM is mapped from 0x0040 to 0x083F in the code area.
RVCTR
Specifies mapping of the vector
table for vector call instructions
and interrupts
Vector table for vector call instruc-
tions
Vector table for interrupt
0 :
0xFFA0 to 0xFFBF in the code area
0xFFC8 to 0xFFFF in the code
area
1 :
0x01A0 to 0x01BF in the code area
0x01C8 to 0x01FD in the code area
System control register 4
SYSCR4
(0x0FDF)
7
6
5
4
3
2
1
0
Bit Symbol
SYSCR4
Read/Write
W
After reset
0
0
0
0
0
0
0
0
SYSCR4
Writes the SYSCR3 data control
code.
0xB2 :
0xD4 :
0x71 :
Enables the contents of SYSCR3<RSTDIS>.
Enables the contents of SYSCR3<RAREA> and SYSCR3 <RVCTR>.
Enables the contents of IRSTSR<FCLR>
Others : Invalid
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: ......