PIC17C7XX_13 Datasheet, PDF (83/306 Pages) Microchip Technology – High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D

FIGURE 10-12: BLOCK DIAGRAM OF RE3/CAP4 PORT PIN
D
Q
ENEN
VDD
P
Q
D
Port
Data
CK
Q
N
Q
D
CK
QS
Note: I/O pin has protection diodes to VDD and VSS.
PIC17C7XX
Peripheral In
Data Bus
RD_PORTE
WR_PORTE
RD_DDRE
WR_DDRE
TABLE 10-9: PORTE FUNCTIONS
Name
Bit Buffer Type
Function
RE0/ALE
bit0
TTL
Input/output or system bus Address Latch Enable (ALE) control pin.
RE1/OE
bit1
TTL
Input/output or system bus Output Enable (OE) control pin.
RE2/WR
RE3/CAP4
bit2
TTL
Input/output or system bus Write (WR) control pin.
bit3
ST
Input/output or Capture4 input pin.
Legend: TTL = TTL input, ST = Schmitt Trigger input
TABLE 10-10: REGISTERS/BITS ASSOCIATED WITH PORTE
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
15h, Bank 1 PORTE
—
—
—
— RE3/CAP4 RE2/WR RE1/OE RE0/ALE
14h, Bank 1 DDRE
14h, Bank 7 CA4L
Data Direction Register for PORTE
Capture4 Low Byte
15h, Bank 7 CA4H
Capture4 High Byte
16h, Bank 7 TCON3
— CA4OVF CA3OVF CA4ED1 CA4ED0 CA3ED1 CA3ED0 PWM3ON
Legend: x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are not used by PORTE.
Value on
POR,
BOR
---- xxxx
---- 1111
xxxx xxxx
xxxx xxxx
-000 0000
MCLR, WDT
---- uuuu
---- 1111
uuuu uuuu
uuuu uuuu
-000 0000
 1998-2013 Microchip Technology Inc.
DS30289C-page 83