Datasheet

Section 17 Flash Memory (F-ZTAT Version)
Rev.7.00 Dec. 24, 2008 Page 571 of 698
REJ09B0074-0700
17.6.2 USB Boot Mode (HD64F2218U, HD64F2212U, and HD64F2211U)
• Features
⎯ Selection of bus-powered mode or self-powered mode
⎯ Supports the USB operating clock generation by 16 MHz system clock with PLL3
multiplication (FWE = 1, MD2 to MD0 = 011) or 24 MHz system clock with PLL2
multiplication (FWE = 1, MD2 to MD0 = 010)
⎯ D+ pull up control connection supported for P36 pin only
⎯ See table 17.6 for enumeration information
Table 17.6 Enumeration Information
USB Standard Ver.1.1
Transfer modes Control (in, out), Bulk (in, out)
Maximum power
Self power mode (UBPM pin = 1)
100 mA
Bus power mode (UBPM pin = 0)
500 mA
Endpoint configuration
EP0 Control (in, out) 64 byte
s
Configuration 1
Interface Number 0
Alte
rn ate Setting 0
EP1 Bulk (in) 64 bytes
EP2 Bulk (out) 64 bytes
• Notes on USB Boot Mode Execution
⎯ Specify 16 MHz or 24 MHz system clock and the FWE and MD2 to MD0 pins correctly.
⎯ Use the P36 pin for D+ pull-up control connection.
⎯ To ensure stable power supply during flash memory programming/erasing, do not use cable
connection via a bus powered HUB.
⎯ Note in particular that, in the worst case, the LSI may be permanently damaged if the USB
cable is detached during flash memory programming/erasing.
⎯ A transition is not made to power-down modes even if the USB bus enters suspend mode
when in bus power mode.