Figure 15.28 Usb External Circuit In Self-Powered Mode (When On-Chip Transceiver Is Used) - Hitachi H8S/2215 Series Hardware Manual

USB
3
*
Pxx
(P36)
VCC
VCC
1
*
Pull-up control
external circuit
for full speed
Notes:* Notes: 1
To protect the LSI, voltage applicable IC such as HD74LV-A series must be used
even when the system power is turned off.
*
2 To cancel software standby state by detecting the USB cable disconnection, the level
shifter signal must also be connected to the
state cannot be canceled by the USB interrupt
*
3 In HD64F2215, HD6432215A, HD6432215B, and HD6432215C, Pxx should be assigned
to an output port as the D+ pull-up control pin.
In HD64F2215U, in which on-chip ROM can be programmed by using the USB, P36
should be used as the D+ pull-up control pin.
Figure 15.28 USB External Circuit in Self-Powered Mode (When On-Chip Transceiver is
Rev. 3.0, 10/02, page 522 of 686
DrVCC
VCC
2
*
VBUS (3.3V)
(3.3V)
1.5k
Internal transceiver
USD+ USD- DrVSS
Rs Rs
1
*
D+ D-
VBUS
GND
(5V)
USB connector
pin. Note that the software standby
.
Used)
VSS
VCC
1: Self-powered mode