Z87233 Datasheet, PDF (16/71 Pages) Zilog, Inc. – CMOS Z8-R MCU Consumer Controller Processor

Z87233
CMOS Z8“ MCU Consumer Controller Processor
10
P34 OUT
P31
+
REF (P33)
-
P37 OUT
P32
+
REF (P33) _-
PCON
0 P34, P37 Standard Output
D0 _{1 P34, P37 Comparator Output}
P34
PAD
P37
PAD
Figure 6.Port 3 Configuration—PCON Register Detail
Autolatch. The autolatch places valid CMOS levels on all CMOS inputs (except
P33–P31) that are not externally driven. Whether this level is 0 or 1 cannot be
determined. A valid CMOS level, rather than a floating node, reduces excessive
supply current flow in the input buffer. Autolatches are available on Port 0, Port 1,
Port 2, and P30. There are no auto latches on P31, P32, and P33.
Note: Deletion of all port autolatches is available as an option when
the device is programmed. The AUTOLATCH DISABLE option
is selected by the customer when the device is programmed.
Functional Description
The Z8 MCU incorporates the following functions that enhance the standard Z8^®
architecture and provide the user with increased design flexibility:
• Program Memory
• ROM Protect
• RAM Protect
• Working Register File
• Expanded Register File
• General-Purpose Registers
• Stack Pointer
PS022701-0104