38K0 Datasheet, PDF (27/133 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

38K0 Group
USB Port External Circuit Configuration
The operation mode of the USB port driver circuit can be config-
ured by USB control register (address 001016).
Figure 25 and Figure 26 show the USB port external circuit block
diagram.
VREFE
VREFCON
DVCC
USB Reference
Voltage Circuit
VREFCON
0
1
0
Hiz
Hiz
1
3.3V output
Normal mode
3.3V output
Low-power mode
USBVREF status
XOUT
PLL
fVCO ^{“1”}
“0”
UCLKCON
fUSB
USB
Module
TRONCON
TRONE
Full
Speed
USBE
+
-
USBDIFE
USBE
Full
Speed
USBVREF
2.2 µF 0.1 µF
TRON
1.5 kΩ
D0+
27 Ω
D0-
27 Ω
USBE
Fig. 25 USB port external circuit (D0+, D0-, USBVREF, TrON) block diagram (4.0V ≤ VCC ≤ 5.25V)
3.0V to 3.6V _(Note)
USBVREF
0.1 µF
XOUT
PLL
fVCO ^{“1”}
“0”
UCLKCON
fUSB
USB
Module
TRONCON
TRONE
Full
Speed
USBE
+
-
USBDIFE
USBE
Full
Speed
TRON
1.5 kΩ
D0+
27 Ω
D0-
27 Ω
USBE
Note: In Vcc = 3.0 V to 3.6 V connect this pin to Vcc.
Fig. 26 USB port external circuit (D0+, D0-, USBVREF, TrON) block diagram (3.0V ≤ VCC ≤ 4.0V)
Rev.3.00 Oct 05, 2006 page 27 of 129
REJ03B0192-0300