DSPIC30F6010 MICROCHIP [Microchip Technology], DSPIC30F6010 Datasheet - Page 143

• Manufacturer Part Number: DSPIC30F6010
• Description: High-Performance Digital Signal Controllers
• Manufacturer: MICROCHIP [Microchip Technology]

21.3
The PIC18F1220/1320 differentiates between various
kinds of Reset:
a)
b)
c)
d)
e)
f)
g)
h)
FIGURE 21-2:
21.3.1
A power-on event will generate an internal POR pulse
when a V
at the POR circuit threshold voltage (V
nominally 1.85V. The device supply voltage character-
istics must meet specified starting voltage and rise rate
requirements. The POR pulse will reset a POR timer
and place the device in the Reset state. The POR also
selects the device clock source identified by the oscil-
lator configuration fuses.
 2004 Microchip Technology Inc.
Power-on Reset (POR)
MCLR Reset during normal operation
MCLR Reset during Sleep
Watchdog Timer (WDT) Reset (during normal
operation)
Programmable Brown-out Reset (BOR)
RESET Instruction
Reset cause by trap lockup (TRAPR)
Reset caused by illegal opcode, or by using an
uninitialized W register as an address pointer
(IOPUWR)
MCLR
V
Illegal Opcode/
Uninitialized W Register
DD
Reset
DD
Instruction
RESET
POR: POWER-ON RESET
rise is detected. The Reset pulse will occur
TRAP Conflict
Brown-out
V
Sleep or Idle
Module
Detect
DD
WDT
Reset
RESET SYSTEM BLOCK DIAGRAM
Rise
BOREN
Glitch Filter
Digital
POR
POR
), which is
BOR
Preliminary
Different registers are affected in different ways by var-
ious Reset conditions. Most registers are not affected
by a WDT wake-up, since this is viewed as the resump-
tion of normal operation. Status bits from the RCON
register are set or cleared differently in different Reset
situations, as indicated in Table 21-5. These bits are
used in software to determine the nature of the Reset.
A block diagram of the on-chip Reset circuit is shown in
Figure 21-2.
A MCLR noise filter is provided in the MCLR Reset
path. The filter detects and ignores small pulses.
Internally generated Resets do not drive MCLR pin low.
The POR circuit inserts a small delay, T
nominally 10 µs and ensures that the device bias cir-
cuits are stable. Furthermore, a user selected power-
up time-out (T
is based on device configuration bits and can be 0 ms
(no delay), 4 ms, 16 ms or 64 ms. The total delay is at
device power-up T
have expired, SYSRST will be negated on the next
leading edge of the Q1 clock, and the PC will jump to
the Reset vector.
The timing for the SYSRST signal is shown in
Figure 21-3 through Figure 21-5.
PWRT
dsPIC30F6010
POR
) is applied. The T
S
R
+ T
PWRT
Q
. When these delays
DS70119D-page 141
PWRT
SYSRST
POR
parameter
, which is