UPD72012 Ver la hoja de datos (PDF) - NEC => Renesas Technology
Número de pieza
componentes Descripción
Lista de partido
UPD72012 Datasheet PDF : 36 Pages
| |||
µPD72012
1.2 Tables by Pin Function
Table 1-1. Oscillator Circuit Switching Control (CLKSEL)
CLKSEL
Type of oscillator circuit
L
Input clocks from 48 MHz oscillator
H
Clock input using 4 MHz crystal resonator (drive circuit is incorporated)
Remark Directly connect to VDD when using CLKSEL=“H”. Even 5 V is no trouble.
Table 1-2. Power Mode/Downstream Port Number Control (PSSEL, PVSEL)
PSSEL
PVSEL
Power mode
Port #1
Port #2
Port #3
Port #4
Port #5
L
L
Self-power Note 1
{
{
{
{
×
L
H
Self-power Note 1
{
{
{
{
{
H
L
Bus power Note 2
{
{
{
{
×
H
H
Prohibited Note 3
–
–
–
–
–
Notes 1.
2.
3.
Do not cut-off clock input when using self-power. If it is cut-off, internal functions stop and operation
may not be possible even if clocks are input again.
When using bus power, up to four ports can be used.
The combination PSSEL=“H”, PVSEL=“H” is prohibited. Operation in this case is not guaranteed.
Remark Also set according to this table when setting the number of ports in a Mask ROM code product to up to
5 ports. Directly connect data lines of unused ports to GND.
Table 1-3. Handling of Pins CS1 to CS5 According to Setting of wHubCharacteristics Field of HUB Class
Descriptor
wHubCharacteristics
CS1
CS2
CS3
CS4
CS5
Bits 4, 3
0b00
Common in all ports
0b01
Port #1
Port #2
Port #3
Port #4
Port #5
0b10 or 0b11
Not available
Not available
Not available
Not available
Not available
Remark Connect pins CS1 to CS5 to the Over Current Detect output pin of the power switch IC.
Clamp an unused or unavailable CS1 to CS5 pin to 3.3 V.
Table 1-4. Handling of Pins PP1 to PP5 According to Setting of wHubCharacteristics Field of HUB Class
Descriptor
wHubCharacteristics
PP1
PP2
PP3
PP4
Bits 1, 0
0b00
Common in all ports
0b01
Port #1
Port #2
Port #3
Port #4
Remark Connect pins PP1 to PP5 to the Port Power Control input pin of the power switch IC.
Leave an unused or unavailable PP1 to PP5 pin open.
PP5
Port #5
10
Data Sheet S13918EJ3V0DS
Share Link: 