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PIC16C621A Datasheet

  • PIC16C621A

  • EPROM-Based 8-Bit CMOS Microcontrollers

  • 2148.18KB

  • 128页

  • Microchip   Microchip

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PIC16C62X
TABLE 9-6:
Condition
Power-on Reset
MCLR reset during normal operation
MCLR reset during SLEEP
WDT reset
WDT Wake-up
Brown-out Reset
Interrupt Wake-up from SLEEP
INITIALIZATION CONDITION FOR SPECIAL REGISTERS
Program
Counter
000h
000h
000h
000h
PC + 1
000h
PC + 1
(1)
STATUS
Register
PCON
Register
0001 1xxx
000u uuuu
0001 0uuu
0000 uuuu
uuu0 0uuu
000x xuuu
uuu1 0uuu
---- --0x
---- --uu
---- --uu
---- --uu
---- --uu
---- --u0
---- --uu
Legend:
u
= unchanged,
x
= unknown,
-
= unimplemented bit, reads as 鈥?鈥?
Note 1: When the wake-up is due to an interrupt and global enable bit, GIE is set, the PC is loaded with the interrupt vector
(0004h) after execution of PC+1.
TABLE 9-7:
INITIALIZATION CONDITION FOR REGISTERS
鈥?MCLR Reset during
normal operation
鈥?MCLR Reset during
SLEEP
鈥?WDT Reset
鈥?Brown-out Reset
(1)
Register
W
INDF
TMR0
PCL
STATUS
FSR
PORTA
PORTB
CMCON
PCLATH
INTCON
PIR1
OPTION
TRISA
TRISB
PIE1
PCON
Address
-
00h
01h
02h
03h
04h
05h
06h
1Fh
0Ah
0Bh
0Ch
81h
85h
86h
8Ch
8Eh
Power-on Reset
鈥?Wake up from SLEEP
through interrupt
鈥?Wake up from SLEEP
through WDT time-out
xxxx xxxx
-
xxxx xxxx
0000 0000
0001
xxxx
---x
xxxx
00--
---0
1xxx
xxxx
xxxx
xxxx
0000
0000
uuuu uuuu
-
uuuu uuuu
0000 0000
000q
uuuu
---u
uuuu
00--
---0
quuu
(4)
uuuu
uuuu
uuuu
0000
0000
uuuu uuuu
-
uuuu uuuu
PC + 1
(3)
uuuq
uuuu
---u
uuuu
uu--
---u
quuu
(4)
uuuu
uuuu
uuuu
uuuu
uuuu
----
(2,5)
uuuu
uuuu
uuuu
----
0000 000x
-0--
1111
---1
1111
-0--
----
1111
1111
1111
----
0000 000u
-0--
1111
---1
1111
-0--
----
1111
1111
1111
----
uuuu uqqq
(2)
-q--
uuuu
---u
uuuu
-u--
---- --uq
(1,6)
000- 0000
VRCON
9Fh
Legend:
u
= unchanged,
x
= unknown,
-
= unimplemented bit, reads as 鈥?鈥?
q
= value depends on condition.
---- --0x
000- 0000
Note 1:
2:
3:
4:
5:
6:
---- --uu
uuu- uuuu
If V
DD
goes too low, Power-on Reset will be activated and registers will be affected differently.
One or more bits in INTCON, PIR1 and/or PIR2 will be affected (to cause wake-up).
When the wake-up is due to an interrupt and the GIE bit is set, the PC is loaded with the interrupt vector (0004h).
See Table 9-6 for reset value for speci铿乧 condition.
If wake-up was due to comparator input changing, then bit 6 = 1. All other interrupts generating a wake-up will cause bit 6 = u.
If reset was due to brown-out, then bit 0 = 0. All other resets will cause bit 0 = u.
DS30235G-page 52
Preliminary
漏
1998 Microchip Technology Inc.

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