ADVANCE INFORMATION
VCT 38xxA
5.18.2.Universal Ports P1 to P3
5.18.2.1. Features
– digital I/O port
There are 24 universal port pins. The universal ports
P1 to P3 are each 8 bits wide. In the 64-pin PSDIP
package only 12 universal port pins are available
(P10−P17, P20−P23).
– special input and output function
– analog input function
– Schmitt trigger input buffer
– tristate output
– push-pull or open-drain output
– 10-mA output current
– output supply either 3.3 V or 5.0 V
ADC In x.y
PxD read
VDD
DBy
VSS
Special In x.y
PxVDD
1
0
Special Out x.y
Px.y
Q
Q
D
D
PxD write
PxM
PxVSS
Q
Q
D
D
PxE
PxO
x: Port number 1 to 3
y: Port pin number 0 to 7
Fig. 5–5: Universal port circuit
Universal ports can be operated in different modes:
Table 5–24: Universal ports operating modes
Modes
Function
The SW uses the ports as digital input.
Port Mode
Normal Input
Special Input
Normal Output
Special Output
The port input is additionally connected to specific hardware modules.
The SW uses the ports as latched digital tristate output.
The port output is directly driven by specific hardware modules.
After reset, all Universal Ports are in normal mode, tristate condition.
Micronas
127
MICRONAS [ MICRONAS ]
