H8SSLASH2218 datasheet(575/750 Pages) RENESAS

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Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 527 of 698

REJ09B0074-0600

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.

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