DS80CH11 Datasheet, PDF (10/88 Pages) Dallas Semiconductor – System Energy Manager

DS80CH11
PIN SYMBOL
DESCRIPTION
87
P1.0 (T2) Port 1/ (Alternate Functions): – I/O. Port 1 provides eight lines which can be individu-
88 P1.1 (T2EX) ally selected as bi–directional I/O port pins or as the alternate functions listed below:
89
P1.2 SCL1
90 P1.3 SDA1
Alternate
91
P1.4 SCL2 Port
Function
Description
92 P1.5 SDA2 P1.0
T2
External I/O for Timer/Counter 2
93
P1.6
P1.1
T2EX
Timer/Counter 2 Capture/Reload Trigger
94
P1.7
P1.2
SCL1
2–Wire Serial Clock 1
P1.3
SDA1
2–Wire Serial Data 1
P1.4
SCL2
2–Wire Serial Clock 2
P1.5
SDA2
2–Wire Serial Data 2
P1.6
(None)
P1.7
(None)
Note that P1.7 – P1.2 are high–drive pins which are always open–drain and must be
used with external pull–ups when used as I/O port pins. P1.1 and P1.0 have internal
pull–up resistors.
109
P2.0 (A8)
Port 2 / Address Outputs A15–8: – I/O. Port 2 is a pseudo–bi–directional I/O port with
110
P2.1 (A9)
internal pull–up resistors. As an alternate function Port 2 can function as MSB of the
111 P2.2 (A10) external address bus.
112 P2.3 (A11)
113 P2.4 (A12)
114 P2.5 (A13)
115 P2.6 (A14)
116 P2.7 (A15)
95 P3.0(RXD0) Port 3 / (Alternate Functions): – I/O. Port 3 provides eight lines each of which can
96 P3.1 (TXD0) serve as psuedo–bi–directional I/O port pins or as the alternate functions as listed
97 P3.2 (INT0) below. Internal pull–up resistors are always present on these pins.
98 P3.3 (INT1)
99
P3.4 (T0)
Alternate
100
P3.5 (T1)
Port
Function
Description
103 P3.6 (WR) P3.0
RXD0
Serial Port 0 Input
104 P3.7 (RD) P3.1
TXD0
Serial Port 0 Output
P3.2
INT0
External Interrupt 0
P3.3
INT1
External Interrupt 1
P3.4
T0
Timer 0 External Input
P3.5
T1
Timer 1 External Input
P3.6
WR
External Data Memory Write Strobe
P3.7
RD
External Data Memory Read Strobe
77 P4.0 (KSI.0) Port 4 / KSI.7–0: – I/O / Keyboard Scan Inputs. Port 4 provides eight lines which can be
78 P4.1 (KSI.1) individually selected as psuedo–bi–directional I/O port pins or as an interrupt Inputs for
79 P4.2 (KSI.2) key scanning. Port 4 pins incorporate Schmitt inputs with pull–up resistors.
80 P4.3 (KSI.3)
81 P4.4 (KSI.4)
82 P4.5 (KSI.5)
83 P4.6 (KSI.6)
84 P4.7 (KSI.7)
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