UM0434 datasheet(182/390 Pages) STMICROELECTRONICS

182 / 390 page

UM0434

Interrupts and exceptions

183/391

When a reset request occurs, the processor branches to the system reset exception vector

(value on

p_rstbase[0:19] concatenated with 0xFFC) without attempting to reach a

recoverable state. If reset occurs during normal operation, all operations stop and machine

state is lost. The internal state of the e200z6e200z3 after a reset is defined in

Chapter 4.18.4: Reset settings.”

For reset initiated by watchdog timer or debug reset control, the e200z6 implements

TSR[WRS] or DBSR[MRR] to help software determine the cause. Watchdog timer and

debug reset control provide the capability to assert

p_resetout_b. External logic may factor

this signal into

p_reset_b to cause an e200z6e200z3 reset.

Table 142 shows the TSR bits associated with reset status.

Table 143 shows the DBSR bits associated with reset status.

Table 144 lists register settings when a system reset is taken.

6.6.18

SPE APU unavailable interrupt (IVOR32)

The SPE APU unavailable exception is taken if MSR[SPE] is cleared and execution of an

SPE APU instruction other than an embedded scalar floating-point or brinc instruction is

attempted. When the SPE APU unavailable exception occurs, the processor suppresses

Table 142.

TSR watchdog timer reset status

Bits

Name

Description

34–35

WRS

00 No action performed by watchdog timer

01 Watchdog timer second timeout caused checkstop.

10 Watchdog timer second timeout caused

p_resetout_b to be asserted.

11 Reserved

Table 143.

DBSR most recent reset

Bits

Name

Function

34–35

MRR

00 No reset occurred since these bits were last cleared by software.

01 A reset occurred since these bits were last cleared by software.

x Reserved

Table 144.

System reset register Settings

Setting description

CSRR0

Undefined

CSRR1

Undefined

MSR

UCLE

FE1

ESR

Cleared

DEAR

Undefined

Vector

[

p_rstbase[0:19]] || 0xFFC

UM0434 Datasheet(PDF) 182 Page - STMicroelectronics

UM0434 Datasheet(HTML) 182 Page - STMicroelectronics

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

Datasheet Download

Link URL