EMAC iPac HCS12, Руководство пользователя

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iPac HCS12 Manual.doc
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Rev 1.2 - 11/11/03
The LCD is connected to the HCS12 processor using pseudo data bus comprised of the processor’s port lines. Table 12
defines these port line assignments. To access PLD Port X, perform a write with A0 = 0. If using an LCD with backlight
capability set PK7 high to turn on the backlight.
Table 12: PLD PSUEDO DATA BUS PORT LINE ASSIGNMENTS
Processor Port Line Description Processor Port Line Description
PB0 DBUS 0 PJ0 DBUS A0
PB1 DBUS 1 PJ1 R/*W
PB2 DBUS 2 PJ6 LCD CS (E)
PB3 DBUS 3
PB4 DBUS 4 PK7 LCD Backlight
PB5 DBUS 5
PB6 DBUS 6
PB7 DBUS 7
2.11 Keypad
This header provides an interface for a 4x4,4x5, or 4x6 matrix Keypad. These row and column scan lines are directly
connected to the processor.
Table 13: KEYPAD (HDR7)
Pin Signal Processor Port Line
1 COL6 PM7
2 COL5 PM6
3 COL4 PM5
4 COL3 PM4
5 COL2 PM3
6 COL1 PM2
7 ROW1 PH4
8 ROW2 PH5
9 ROW 3 PH6
10 ROW 4 PH7
11 ESD SHIELD ESD SHIELD
2.12 Real Time Clock (RTC)
The iPac HCS12 can be purchased with an optional battery backed real time clock (DS1305E). This clock is accessed using
the processors SPI port. This SPI port is shared with the optional 12-bit A/D & D/A. The processor port line assignments are
defined in Table 14.
Table 14: OPTIONAL RTC PORT LINE ASSIGNMENTS
Processor Port Line Description Processor Port Line Description
PS4 MISI PK2 RTC CS
PS5 MOSI
PS6 SCLK