Usb Interface - Citizen CLP-621 Technical Manual

2-4. Interface
[Timing relationship between BUSY and ACK]
BUSY
ACK

2-4-3. USB Interface

(1) Specifications
Standards
Transmission speed
Receive buffer
Connector
(2) Signal line and pin arrangement
Pin No. Signal code
1 VBUS
2 D+
3 D-
4 GND
CLP-621 & CLP-631
Complies with Universal Serial Bus Specification
Compatible with 12Mbps (full speed) transmission
16K bytes
DUSB DUSB-BRA42-T11 (DDK)
Signal
USB power USB power (+5V)
Signal line + + signal line
Signal line - - signal line
GND GND
2-54
Center
About 2 µsec
Function