H8S2218 Datasheet, PDF (575/750 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

Section 14 Universal Serial Bus (USB)
14.8 Usage Notes
14.8.1 Emulator Usage Notes
1. If UEDR0o and UEDR2 are displayed using the I/O register window function, or the like, the
EP0o FIFO or EP2 FIFO read pointer will not operate properly, preventing UEDR0o, UESZ0o,
UEDR2, and UESZ2 from being read correctly. Therefore, UEDR0o and UEDR2 should not
be displayed.
2. In the E6000, since the USB module is mounted on the external extended board and accessed
as an external module, there are some limitations as shown below. These limitations do not
apply to the E10A or to product chips.
• USB operation is not supported in the H8S/2218 Group’s mode 7 (single-chip mode).
• When using the USB module in the H8S/2218 Group’s mode 6 (on-chip ROM-enabled mode)
or the H8S/2212 Group’s mode 7 (single-chip mode), CS6 and A9 to A0 are input pins in the
initial status. Therefore, CS6 and A9 to A0 must be set as output pins (= B'0010) by setting
P72DDR to 1, AE3 to AE0 to B'0010, and PC7DDR to PC0DDR to H'FF before accessing the
USB module.
• When using the USB module in the H8S/2218 Group’s modes 4 and 5 (on-chip ROM-disabled
mode), CS6 and A9 to A8 must be set as output pins by setting P72DDR to 1 and AE3 to AE0
to B'0010.
14.8.2 Bus Interface
The USB module's interface is based on the bus specifications of external area 6. Accordingly,
before accessing the USB module, area 6 must be specified as having an 8-bit bus width and 3-
state access using the bus controller register.
Address H'C00100 to H'DFFFFF is for USB reserved area and thus access prohibited.
14.8.3 Operating Frequency
The main clock of this LSI must be 24 MHz or 16 MHz. This 24-MHz main clock, used as base
clock, is doubled in the on-chip PLL circuit or this 16-MHz main clock, also used as base clock, is
tripled in the on-chip PLL circuit, to generate the 48-MHz USB operating clock. Since the USB
module does not support medium-speed mode, sleep mode, watch mode, subactive mode, and
subsleep mode, make sure to use full-speed mode.
Rev.6.00 Jun. 03, 2008 Page 527 of 698
REJ09B0074-0600