tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 52
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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2.4 Reset Control Circuit
2. CPU Core
RA001
2.4 Reset Control Circuit
P10(RESET)
Power-on reset signal
Voltage detection reset 1 signal
Voltage detection reset 2 signal
Watchdog timer reset signal
System clock reset signal
Trimming data reset signal
Flash standby reset signal
System control register 3
2.4.1 Configuration
2.4.2 Control
(0x0FDE)
SYSCR3
The reset circuit controls the external and internal factor resets and initializes the system.
Note 1: The enabled SYSCR3<RSTDIS> is initialized by a power-on reset only, and cannot be initialized by an external reset input
Note 2: The value of SYSCR3<RSTDIS> is invalid until 0xB2 is written into SYSCR4.
(SYSCR4), system control status register (SYSSR4) and the internal factor reset detection status register
(IRSTSR).
The reset control circuit consists of the following reset signal generation circuits:
The reset control circuit is controlled by system control register 3 (SYSCR3), system control register 4
or internal factor reset. The value written in SYSCR3 is reset by a power-on reset, external reset input or internal factor
reset.
Read/Write
Bit Symbol
After reset
1. External reset input (external factor)
2. Power-on reset (internal factor)
3. Voltage detection reset 1 (internal factor)
4. Voltage detection reset 2 (internal factor)
5. Watchdog timer reset (internal factor)
6. System clock reset (internal factor)
7. Trimming data reset (internal factor)
8. Flash standby reset (internal factor)
P10 port
RSTDIS
R
7
0
External reset input enable register
-
Figure 2-14 Reset Control Circuit
R
6
0
-
R
5
0
-
Page 38
Warm-up
counter reset
signal
R
4
0
-
0 : Enables the external reset input.
1 : Disables the external reset input.
Internal factor reset detection status register,
Voltage detection circuit reset signal
External reset input enable reset signal
System clock control circuit
Warm-up counter
R
3
0
-
(RVCTR)
R/W
2
0
(RAREA)
R/W
1
0
CPU/peripheral
circuits reset signal
TMP89FM42
RSTDIS
R/W
0
0
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