tmp89fm82 TOSHIBA Semiconductor CORPORATION, tmp89fm82 Datasheet - Page 58

• Manufacturer Part Number: tmp89fm82
• Description: 8 Bit Microcontroller Tlcs-870/c1 Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.4
Reset Control Circuit
RA000
2.4
2.4.1
2.4.2
System control register 4
(0x0FDF)
SYSCR4
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
Reset Control Circuit
The reset circuit controls the external and internal factor resets and initializes the system.
Note 1: SYSCR4 is a write-only register, and must not be accessed by using a read-modify-write instruction, such as a bit oper-
Note 2: After IRSTSR<FCLR> is modified, SYSCR4 should be written 0x71 (Enable code for IRSTSR<FCLR> in NORMAL mode
detection status register (IRSTSR).
Configuration
Control
The reset control circuit consists of the following reset signal generation circuits:
The reset control circuit is controlled by system control register 4 (SYSCR4) and the internal factor reset
SYSCR4
Read/Write
Bit Symbol
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)
After reset
ation.
when fcgck is fc/4 (CGCR<FCGCKSEL>=00). Otherwise, IRSTSR<FCLR> may be enabled at unexpected timing.
P10 port
Writes the SYSCR3 data control
code.
7
0
Figure 2-16 Reset Control Circuit
6
0
5
0
Others :
Page 42
Warm-up
counter reset
signal
0xD4 :
0x71 :
Enables the contents of SYSCR3<RAREA> and SYSCR3 <RVCTR>
Enables the contents of IRSTSR<FCLR>
Invalid
4
0
Internal factor reset detection status register,
Voltage detection circuit reset signal
External reset input enable reset signal
SYSCR4
W
System clock control circuit
Warm-up counter
3
0
2
0
CPU/peripheral
circuits reset signal
1
0
TMP89FM82
0
0