Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 64

• Manufacturer Part Number: Z8FMC04100
• Description: Z8 Encore-R Motor Control Flash MCUs
• Manufacturer: ZILOG [Zilog, Inc.]

42
Z8 Encore!
Product Specification
General-Purpose I/O
Bit
Position
[7:0]
Data
Direction
RESET
FIELD
ADDR
BITS
R/W
Caution:
®
DD7
R/W
Value
(H)
0
1
Motor Control Flash MCUs
If 01H in Port A–C Address Register, accessible through the Port A-C Control Register
7
1
Table 18. Port A–C Data Direction Sub-Registers
In each of these three data direction subregisters, bits [7:0] control the direction of the
associated port pin. Port Alternate Function operation overrides the Data Direction Regis-
ter setting.
If the value of the bit is 0, the direction is output, and data in the Port A–C Output Data
registers is driven onto the port pin.
If the value of the bit is 1, the direction is input. The port pin is sampled, the value is writ-
ten into the Port A–C Input Data registers, and the output driver is tristated.
Port A–B Alternate Function 0 Subregisters
The Port A–B Alternate Function subregisters, shown in Table 19, are accessed through
the Port A–B Control registers by writing
A–B Alternate Function subregisters select the alternate functions for the selected pins.
Refer to the
tion associated with each port pin.
Do not enable alternate function for GPIO port pins which do not have an associated al-
ternate function. Failure to follow this guideline may result in unpredictable operation.
Description
These bits control the direction of the associated port pin. Port Alternate Function
operation overrides the Data Direction register setting.
Output. Data in the Port A–C Output Data register is driven onto the port pin.
Input. The port pin is sampled and the value written into the Port A–C Input Data
Register. The output driver is tristated
DD6
R/W
6
1
GPIO Alternate Functions
DD5
R/W
5
1
P R E L I M I N A R Y
DD4
R/W
4
1
section on page 36 to determine the alternate func-
02h
DD3
R/W
to the Port A–B Address registers. The Port
3
1
DD2
R/W
2
1
DD1
R/W
1
1
PS024604-1005
DD0
R/W
0
1