PIC17C75X
FIGURE 10-12: BLOCK DIAGRAM OF RE3/CAP4 PORT PIN
Peripheral In
D
EN
EN
Q
Data Bus
V
DD
RD_PORTE
P
Q
Port
Data
Q
CK
D
WR_PORTE
N
Q
CK
S
D
RD_DDRE
WR_DDRE
Q
Note: I/O pin has protection diodes to V
DD
and Vss.
TABLE 10-9:
Name
PORTE FUNCTIONS
Bit
Buffer Type
Function
RE0/ALE
bit0
RE1/OE
bit1
RE2/WR
bit2
RE3/CAP4
bit3
Legend: TTL = TTL input.
TTL
Input/Output or system bus Address Latch Enable (ALE) control pin.
TTL
Input/Output or system bus Output Enable (OE) control pin.
TTL
Input/Output or system bus Write (WR) control pin.
ST
Input/Output or Capture4 input pin
ST = Schmitt Trigger input
TABLE 10-10: REGISTERS/BITS ASSOCIATED WITH PORTE
Address
15h, Bank 1
14h, Bank 1
14h, Bank 7
15h, Bank 7
16h, Bank 7
Name
PORTE
DDRE
CA4L
CA4H
TCON3
Bit 7
鈥?/div>
Bit 6
鈥?/div>
Bit 5
鈥?/div>
Bit 4
鈥?/div>
Bit 3
RE3/CAP4
Bit 2
RE2/WR
Bit 1
RE1/OE
Bit 0
RE0/ALE
Value on,
POR,
BOR
---- xxxx
---- 1111
xxxx xxxx
xxxx xxxx
CA3OVF
CA4ED1
CA4ED0
CA3ED1
CA3ED0 PWM3ON
-000 0000
Value on all
other resets
(Note1)
---- uuuu
---- 1111
uuuu uuuu
uuuu uuuu
-000 0000
Data direction register for PORTE
Capture4 low byte
Capture4 high byte
鈥?/div>
CA4OVF
Legend:
x
= unknown,
u
= unchanged,
-
= unimplemented read as '0'. Shaded cells are not used by PORTE.
Note 1: Other (non power-up) resets include: external reset through MCLR and the Watchdog Timer Reset.
漏
1997 Microchip Technology Inc.
Preliminary
DS30264A-page 77
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