upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 391
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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12.7.6 USB connection example
(1) Pull-up control of D+
To prohibit connection notification (D+ pull-up) to the USB host/HUB (such as while higher priority processing
or initialization processing is under execution), the system must control pull-up of D+ via the USBPUC pin.
In the circuit example in Figure 12-26, D+ is pulled up because the USBPUC pin is set to output low level by
the initial value after reset.
To prohibit pull-up of D+, be sure to set the CONNECT bit of the UF0GPR register to 1 after reset, and then
output the high level from the USBPUC pin.
CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
µ
PD78F0730
Figure 12-26. USB Connection Example
UF0GPR
CONNECT
USBPUC
Preliminary User’s Manual U19014EJ1V0UD
USBM
USBP
27 Ω ±5 %
27 Ω ±5 %
UV
DD
IC
1.5 kΩ ±5 %
D+
D-
391
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