7643 datasheet(239/424 Pages) RENESAS

239 / 424 page

Rev.2.00

Aug 28, 2006

page 118 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

Fig. 2.6.16 Structure of USB endpoint x (x=0 to 2) IN max. packet size register

USB endpoint x IN max. packet size register

b7 b6 b5 b4 b3 b2 b1 b0

USB endpoint x IN max. packet size register

(IN_MAXP: address 5B16)

(Note)

Functions

At reset R W

(Note)

The maximum packet size (MAXP) of endpoint x IN is contained.

qMAXP = n for endpoints 0, 2

qMAXP = n ✕ 8 for endpoint 1

“n” is a written value into this register.

Note: The value is “0116” in the endpoint 1 used.

The value is “0816” in the endpoint 0 or 2 used.

(10) USB endpoint x (x = 0 to 2) IN max. packet size register

This register specifies the maximum packet size (MAXP) of an endpoint x (x = 0 to 2) IN packet.

Modify the contents of this register when the SET_DESCRIPTOR command is received from the

host CPU. The IN maximum packet sizes (MAXP) are as follows:

- When using endpoints 0, 2: MAXP = n

- When using endpoint 1: MAXP = n*8 (n: the value set in this register)

When not using this register, clear “0” to this register.

Figure 2.6.16 shows the structure of the USB endpoinx (x = 0 to 2) IN max. packet size register.

7643 Datasheet(PDF) 239 Page - Renesas Technology Corp