TMP86FS64FG datasheet(49/252 Pages) TOSHIBA

49 / 252 page

Page 37

TMP86FS64FG

Figure 2-15 Reset Circuit

2.3.2 Address-Trap-Reset

If the CPU runs away due to spurious noises and attempts to fetch an instruction form the on-chip RAM

(WDTCR1<ATA> = 1) or the SFR area, an address-trap-reset is generated. The reset time is a maximum of 24/

fc [s] (1.5

µs @16.0 MHz).

If the CPU runs away due to spurious noises and attempts to fetch an instruction from the on-chip RAM

(WDTCR1<ATAS> = 1), the DBR or the SFR area, an address-trap-reset is generated. The reset time is a max-

imum of 24/fc [s] (1.5

µs @16.0 MHz).

Note:Either a reset or an interrupt can be selected for an address-trap. An address-trap area can be specified.

Note 1: "a" is the address in on-chip RAM (WDTCR1<ATAS>=1), SFR or DBR area.

Note 2: During the reset release process, the reset vector "r" is read out, and an instruction at the address "r" is fetched and

decoded.

Figure 2-16 Address Trap Reset

2.3.3 Watchdog Timer Reset

Refer to "Watchdog Timer".

2.3.4 System Clock Reset

Either one of the following conditions is met, a system clock reset is generated automatically to prevent the

CPU to be in the deadlock condition. (Oscillation is continued.)

• SYSCR2<XEN> and SYSCR2<XTEN> are cleared to 0.

• SYSCR2<XEN> is cleared to 0 when SYSCR2<SYSCK> = 0.

• SYSCR2<XTEN> is cleared to 0 when SYSCR2<SYSCK> = 1.

The reset time is a maximum of 24/fc [s] (1.5

µs @160.0 MHz).

Reset input

VDD

RESET

Internal factor reset

output circuit

Watchdog timer

Address trap detection

System clock detection

Instruction

execution

Internal reset signal

An address-trap is generated

4/fc to 12/fc [s]

max 24/fc [s]

16/fc [s]

Reset released

Instruction at r

address

TMP86FS64FG датащи(PDF) 49 Page - Toshiba Semiconductor

TMP86FS64FG датащи(HTML) 49 Page - Toshiba Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL