SH7280 Datasheet, PDF (1451/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 26 Flash Memory
26.5.2 USB Boot Mode (SH7286 and SH7285)
The USB boot mode is for conducting programming and erasure of the user mat by sending
control commands and data for programming from an externally connected host via the USB.
For USB boot mode, a tool for transmitting the control commands and data to be programmed, as
well as the data itself, must be prepared on the host side. Figure 26.9 shows a system configuration
for USB boot mode. Interrupt requests generated in USB boot mode are ignored. On the system
side, ensure that interrupt requests are not generated.
Host or
self-powered HUB
1
FWE*
This LSI
11
MD1* MD0*
PB10 (PBIO)
Flash memory
1.5 kΩ
D+
Data
transmission
D-
VBUS
Rs _USD+
Rs ^USD-
VBUS
USB
On-chip
RAM
EXTAL
XTAL
USBEXTAL
USBXTAL
PLLVSS
PC0
System clock
12 MHz
USB resonator
PLL external
circuit settings
Clock selection
Note * FWE pin and mode pin input must satisfy the mode programming setup time (tMDS = 200 ns) when a reset is released.
Figure 26.9 System Configuration Diagram when Using USB Boot Mode
(1) Features
• Bus power mode and self power mode are selectable.
• D+ pull-up control connection supported for the PBIO pin only.
• See table 26.8 for enumeration information.
Table 26.8 Enumeration Information
USB standard
Transfer modes
Endpoint configuration
Ver.2.0 (Full-speed)
Control (in, out), Bulk (in, out)
EP0 Control (in, out) 64 Bytes
Configuration 1
InterfaceNumber 0
AlternateSetting 0
EP1 Bulk (out) 64 Bytes
EP2 Bulk (in) 64 Bytes
Rev. 1.00 Jun. 26, 2008 Page 1421 of 1692
REJ09B0393-0100