ST92T163 ST Microelectronics, ST92T163 Datasheet - Page 13

• Manufacturer Part Number: ST92T163
• Description: 8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS
• Manufacturer: ST Microelectronics

1.3 I/O Port Pins
All the ports of the device can be programmed as
Input/Output or in Input mode, compatible with
TTL or CMOS levels (except where Schmitt Trig-
ger is present). Each bit can be programmed indi-
vidually (Refer to the I/O ports chapter).
TTL/CMOS Input
For all those port bits where no input schmitt trig-
ger is implemented, it is always possible to pro-
gram the input level as TTL or CMOS compatible
by programming the relevant PxC2.n control bit.
Refer I/O Ports Chapter to the section titled “Input/
Output Bit Configuration”.
Table 3. I/O Port Characteristics
Legend: WPU = Weak Pull-Up, OD = Open Drain
Port 0[7:0]
Port 1[7:0]
Port 3[7:0]
Port 4[3:0]
Port 5[7:0]
Port 6[1:0]
Port 6[5:2]
Port 6.6
Port 6.7
Input
TTL/CMOS
TTL/CMOS
Schmitt trigger Push-Pull/OD
Schmitt trigger Push-Pull/OD
Schmitt trigger Push-Pull/OD
Schmitt trigger
TTL/CMOS
Schmitt trigger
TTL/CMOS
Output
Push-Pull/OD
Push-Pull/OD
Pure Open Drain with high sink capability
Push-Pull/OD with high sink capability
Push-Pull/OD with high sink capability
Push-Pull/OD with high sink capability
Push-Pull/OD Output
The output buffer can be programmed as push-
pull or open-drain: attention must be paid to the
fact that the open-drain option corresponds only to
a disabling of P-channel MOS transistor of the
buffer itself: it is still present and physically con-
nected to the pin. Consequently it is not possible to
increase the output voltage on the pin over
V
Pure Open-drain Output
The user can increase the voltage on an I/O pin
over V
sistor is physically absent: this is allowed on all
“Pure Open Drain” pins. Of course, in this case the
push-pull option is not available and any weak
pull-up must implemented externally.
DD
+0.3 Volt, to avoid direct junction biasing.
DD
ST92163 - GENERAL DESCRIPTION
+0.3 Volt where the P-channel MOS tran-
Weak Pull-Up
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
Reset State
Bidirectional WPU
Bidirectional WPU
Bidirectional WPU
Bidirectional WPU
Bidirectional WPU
Bidirectional
Bidirectional WPU
Bidirectional
Bidirectional
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