DS80CH11 Maxim, DS80CH11 Datasheet - Page 55

• 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

9.0 HOST INTERFACE PORTS
9.1 OVERVIEW
The SEM provides three interface ports to the host CPU
which are hardware–compatible with the interface to the
8042 keyboard controller IC as it is used in conventional
PC system designs. One of the interface ports is
intended to be assigned to the standard keyboard con-
troller function. The host thereby communicates to the
SEM as a slave microcontroller in receiving key scan
MICROCONTROLLER SYSTEM INTERFACE PORTS Figure 9–1
9.2 REGISTER MAPPING
The KBCS line is used by the host system in selecting
the keyboard system interface port, while the PM1CS
line selects the identical power management#1 inter-
face port and the PM2CS line selects the power man-
PM1CS
PM2CS
KBCS
A0
REGISTER
REGISTER
REGISTER
DECODE
DECODE
DECODE
ENABLE
ENABLE
ENABLE
SD7–SD0
SMI1
SMI2
KBOBF
IOW
IOR
inputs as it does with the 8042 in these systems. The
other two ports can be assigned as communication
channels to the SEM to support power management
and/or other functions.
agement #2 interface port. Each set of system interface
registers occupy three memory locations in the SEM,
and the host. Table 9–1 summarizes access of the three
interface ports by the host system, and Table 9–2 sum-
marizes access to the port registers by the SEM.
DATA BUFFER
DATA BUFFER
DATA BUFFER
DATA BUFFER
DATA BUFFER
DATA BUFFER
STATUS REG.
STATUS REG.
STATUS REG.
PMDOUT1
PMDOUT2
OUTPUT
OUTPUT
KBDOUT
OUTPUT
PMSTAT1
PMSTAT2
PMDIN1
PMDIN2
KBSTAT
KBDIN
INPUT
INPUT
INPUT
R/W
0ADH
RD
0AEH
R/W
0AFH
R/W
0BDH
RD
0BEH
R/W
0BFH
R/W
0F5h
RD
0F6h
R/W
0F7h
INTERNAL
DATA BUS
011200 55/88
DS80CH11