Datasheet

Table Of Contents
Section 15 Universal Serial Bus Interface (USB)
Page 588 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
1: Self-powered mode
Internal transceiver
Pxx
(P36)
1.5 kΩ
DrVCC
(3.3 V)
3.3 V
VBUS
(5 V)
USD+ USD-
D+ D-
DrVSS
GND
UBPMVBUS
VCC
(3.3 V)
IRQx
VCC
VCC
VSS
USB connector
*
1
*
2
USB
To protect the LSI, voltage applicable IC such as HD74LV-A series must be used
even when the system power is turned off.
To cancel software standby state by detecting the USB cable disconnection, the level
shifter signal must also be connected to the IRQx pin. Note that the software standby
state cannot be canceled by the USB interrupt EXIRQx.
In HD64F2215, HD64F2215R, HD64F2215T, HD6432215B, and HD6432215C,
Pxx should be assigned to an output port as the D+ pull-up control pin.
In HD64F2215U, HD64F2215RU, HD64F2215TU and HD64F2215CU, in which on-chip ROM can be
programmed by using the USB, P36 should be used as the D+ pull-up control pin.
Steps should be taken prevent noise from affecting the VBUS terminal during USB communications.
Pull-up control
external circuit
for full speed
1.
2.
3.
4.
Notes:
VCC
*
3
*
1
Notes:
*
4
24 Ω 24 Ω
Figure 15.31 USB External Circuit in Self-Powered Mode
(When On-Chip Transceiver Is Used)