tmp86c847iug TOSHIBA Semiconductor CORPORATION, tmp86c847iug Datasheet - Page 38
tmp86c847iug
Manufacturer Part Number
tmp86c847iug
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP86C847IUG.pdf
(160 pages)
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2.3 Reset Circuit
2. Operational Description
Instruction
execution
RESET output
Internal reset
signal
2.3.2 Address trap reset
2.3.3 Watchdog timer reset
2.3.4 System clock reset
Note 1: Address “a” is on-chip RAM (WDTCR1<ATAS> = “1”) space or SFR area.
Note 2: During reset release, reset vector “r” is read out, and an instruction at address “r” is fetched and decoded.
Note 3: Varies on account of external condition: voltage or capacitance
from the on-chip RAM (when WDTCR1<ATAS> is set to “1”) or SFR area, address trap reset will be gener-
ated. The reset time is maximum 24/fc[s] (1.5µs at 16.0 MHz). Then, the
maximum 24/fc[s].
CPU. (The oscillation is continued without stopping.)
mum 24/fc[s] (1.5µs at 16.0MHz).
If the CPU should start looping for some cause such as noise and an attempt be made to fetch an instruction
Note:The operating mode under address trapped is alternative of reset or interrupt. The address trap area is alter-
Refer to Section “Watchdog Timer”.
If the condition as follows is detected, the system clock reset occurs automatically to prevent dead lock of the
The reset time is maximum 24/fc (1.5 µs at 16.0 MHz). Then, the
- In case of clearing SYSCR2<XEN> and SYSCR2<XTEN> simultaneously to “0”.
- In case of clearing SYSCR2<XEN> to “0”, when the SYSCR2<SYSCK> is “0”.
- In case of clearing SYSCR2<XTEN> to “0”, when the SYSCR2<SYSCK> is “1”.
native.
JP a
Address trap is occurred
Maximum 24/fc [s]
Figure 2-16 Address Trap Reset
("L" output)
Note 3
Page 30
4/fc to 12/fc [s]
RESET
RESET
Reset release
pin outputs "L" level during maxi-
16/fc [s]
pin outputs "L" level during
Instruction at address r
TMP86C847IUG
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