tmp88cs43fg TOSHIBA Semiconductor CORPORATION, tmp88cs43fg Datasheet - Page 34

• Manufacturer Part Number: tmp88cs43fg
• Description: 8 Bit Microcontroller Tlcs-870/x Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2. Functional Description
2.1 Functions of the CPU Core
Address Trap Control Register
Address Trap Control Code Register
(1F94H)
(1F95H)
ATKEY
ATAS
2.1.5.3
2.1.5.4
Note: Read-modify-write instructions, such as a bit manipulation, cannot access ATAS or ATKEY register because these register
are write only.
The address trap is permited initially and the internal reset is generated by fetching from internal
RAM,SFR or DBR area. If the address trap is prohibited, instructions in the internal RAM area can be
executed.
SYSCR2<SYSCK> = 0, the system clock is turned off, causing the CPU to become locked up. To prevent
this problem, upon detecting SYSCR2<XEN> = 0, SYSCR2<XEN> = SYSCR2<SYSCK> = 0 or
SYSCR2<SYSCK> = 1, the device automatically generates an internal reset signal to let the system clock
continue oscillating.
ATKEY
ATAS
7
7
-
Watchdog Timer Reset
System Clock Reset
The addess trap permission/prohibition is set by the address trap reset control register (ATAS,ATKEY).
Note 1: In development tools, address trap cannot be prohibited in the internal RAM,SFR or DBR area with
Note 2: While the SWI instruction at an address immediately before the address trap area is executing, the
Development tool setting
Refer to the Section “Watchdog Timer.”
When SYSCR2<XEN> is cleared to 0 or when SYSCR2<XEN> is cleared to 0 while
• To prohibit the address trap:
the address trap control registers. When using development tools, even if the address trap permis-
sion/prohibition setting is changed in the user’s program, this change is ineffective. To execute
instructions from the RAM area, development tools must be set accordingly.
program counter is incremented to point to the next address in the address trap area; an address trap
is therefore taken immediately.
6
Select the address trap
permission / prohibition
6
Write control code to prohibit
address trap
-
1. Modify the iram (mapping attribute) area to (00040H to 000BFH) in the memory map win-
2. Set 000C0H to "address trap prohibition area" as a new eram (mapping attribute) area.
3. Load the user program
4. Execute the address trap prohibition code in the user’s program
dow.
5
5
-
4
4
-
0: Permit address trap
1: Prohibit address trap
D2H: Address trap prohibition code
Others: Ineffective
3
3
-
(It may be available after setting control code for ATKEY register)
Page 24
2
2
-
1
1
-
ATAS
0
0
(initial value: **** ***0)
(initial value: **** ****)
TMP88CS43FG
Write
Write
only
only