DS80CH11 Maxim, DS80CH11 Datasheet - Page 31

• Manufacturer Part Number: DS80CH11
• Description: The system energy manager is a highly integrated microcontroller that provides several key features for systems including key scanning and control, battery and power management, as well as two 2-Wire serial I/O Ports
• Manufacturer: Maxim

WATCHDOG TIMER INTERRUPT / RESET TIMEOUT VALUES Table 5–1
5.4 PARALLEL I/O PORTS
The SEM incorporates the original four pseudo–bi–
directional parallel I/O ports found in the 80C52: Ports
0, 1, 2 and 3. All of these ports operate logically as docu-
mented in the Dallas High Speed Micro User’s Guide.
All of the Port 0, 1, 2, and 3 pins exhibit the same electri-
cal characteristics as documented in the user’s guide
except for P1.7 – P1.2 which are open–drain pins.
In addition to these basic ports, the SEM adds an addi-
tional seven 8–bit ports. All of these additional ports
incorporate the same logical I/O structure as the original
four, Ports 0 through 3.
grammed the same as Ports 0–3. The SFR addresses
for the new ports are as follows:
PORT PIN ALTERNATE FUNCTIONS Table 5–2
WD1
P0.7 – P0.0
P2.7 – P2.0
0
0
1
1
PIN(S)
P1.7
P1.6
P1.5
P1.4
P1.3
P1.2
P1.1
P1.0
P3.7
P3.6
P3.5
P3.4
P3.3
P3.2
P3.1
WD0
0
1
0
1
INTERRUPT
TIME–OUT
2
2
2
2
ALTERNATE
AD7 – AD0
17
20
23
26
A15 – A8
Therefore, they are pro-
PIN(S)
SDA2
SDA1
clocks
clocks
clocks
clocks
SCL2
SCL1
T2EX
TXD0
INT1
INT0
WR
RD
T2
T1
T0
–
–
TIME (25 MHz)
Mux. addr. / data bus
None
None
2–Wire Serial Port Data Input/Output 2
2–Wire Serial Port Clock 2
2–Wire serial port data Input / Output 1
2–Wire serial port clock 1
Timer 2 capture / reload input
Timer 2 output pulse
Address bus outputs
Read strobe output
Write strobe output
Timer 1 input
Timer 0 input
External interrupt 1 input (active low)
External interrupt 0 input (active low)
UART Transmit
2684.35 ms
335.54 ms
5.243 ms
41.94 ms
Port 4:
Port 5:
Port 6:
Port 7:
Port 8:
Port 9:
Port 10: 0F4H
5.4.1
A number of port pins on the SEM offer an optional alter-
nate function. These functions are individually select-
able; i.e. each pin can be programmed for use as a gen-
eral purpose I/O or to serve the alternate function. In
order to use the alternate function, the associated port
latch must be programmed to a 1. The alternate func-
tions are summarized in Table 5–2 below.
ALTERNATE FUNCTION(S)
Alternate Pin Function Summary
0A4H
0ACH
0BCH
0D4H
0E4H
0ECH
2
2
2
2
17
20
23
26
TIME–OUT
+ 512 clocks
+ 512 clocks
+ 512 clocks
+ 512 clocks
RESET
TIME (25 MHz)
2684.38 ms
335.56 ms
5.263 ms
41.96 ms
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DS80CH11