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Functional Overview
2.7 USB Interface
Rev.1.04
2008.7.10
2-12
REJ10J1564-0104
2
SH7285
USBEXTAL
USBXTAL
Oscillator (48MHz)
Not mounted
VBUS
DrVCC
DrVSS
USD-
USD+
3.3V
USB
series B
connector
Vbus
D+
D-
GND
Ceralock
(Murata)
OE
3.3V
PB10
Vbus PB10 VBUS D+ Remarks
0 0 0 Hi-Z Initial value
0 1 0 Hi-Z
1 0 0 Hi-Z
1 1 Pull-up When USB is connected
2.7 USB Interface
The M3A-HS85 contains a USB connector (Standard-B receptacle).
When a cable is connected to USB host/hub in the state that this CPU board is not turned on, the voltage is
impressed from USB host/hub to VBUS. Thus, the CPU board should be turned on before USB cable is connected.
When you want to delay a notification of connection to USB host/hub (the cases such as in the processing of high
priority or initialization), it can be controlled by PB10. The powered state is kept regardless of the states USD+ and
USD- when pin VBUS of SH7285 is set to low level.
Figure 2.7.1 shows the block diagram of M3A-HS85 USB interface.
Figure 2.7.1 Block Diagram of USB Interface