MC68HC11PH8 Datasheet, PDF (44/264 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

2.11.8 Port H
2
Port H is an 8-bit general purpose I/O port with a data register (PORTH) and a data direction
register (DDRH). Port H pins support either input/output, pulse-width modulation channels (pins
[3:0]) or act as clock inputs for two of the 8-bit modulus timers (pins [7,6]).
PORTH can be read at any time and always returns the pin level.
Port H pins include on-chip pull-up devices that can be enabled or disabled via the port pull-up
assignment register (PPAR). Port H pins can be configured for wired-OR interrupt to wake-up from
WAIT or STOP mode under control of the wired-OR interrupt register (WOIEH).
For further information, refer to Section 4 and Section 8 (timer system).
2.12
LCD module
The MC68HC11PH8 incorporates an LCD module that allows four LCD segments to be driven
under control of the LCD control and data register. The four frontplane signals are output on port
B pins [7:4], with the backplane signal output on PG6. A segment is ON when the corresponding
frontplane and backplane are equal in frequency and opposite in phase. The LCD function can be
enabled in any mode.
2.12.1 LCDR — LCD control and data register
LCD control and data (LCDR)
Address bit 7 bit 6 bit 5 bit 4 bit 3
$002D LCD7 LCD6 LCD5 LCD4 0
bit 2
bit 1
bit 0
State
on reset
0 LCDCK LCDE 0000 0000
LCD[7:4] — LCD segment data
1 (set) – Segment ON (corresponding LCD output port B is opposite in phase
to LCDBP).
0 (clear) – Segment OFF (corresponding LCD output port B is in phase with
LCDBP).
When LCD[7:4] are all cleared, the LCD backplane is forced low^† and all the LCD segments are
off, thus reducing power consumption and RFI emissions.
† This is not the case on early versions of the MC68HC711PH8; contact your local Motorola
Sales Representative for more information.
MOTOROLA
2-18
PIN DESCRIPTIONS
TPG
MC68HC11PH8