7641 datasheet(74/385 Pages) RENESAS

74 / 385 page

Rev.2.00

Aug 28, 2006

page 57 of 113

7641 Group

REJ09B0336-0200

HARDWARE

FUNCTIONAL DESCRIPTION

[USB Endpoint x (x = 0 to 4) IN Max. Packet Size Register]

IN_MAXP

This register specifies the maximum packet size (MAXP) of an

endpoint x IN packet. The value set for endpoint 1 is the number

of transmitted bytes divided by 8, and the value set for endpoints

0, 2, 3, and 4 is the actual number of transmitted bytes. The CPU

can change these values using the SET_DESCRIPTOR com-

mand.

The initial value for endpoints 0, 2, 3 and 4 is 8, and the initial

value for endpoint 1 is 1.

[USB Endpoint x (x = 0 to 4) OUT Max. Packet Size Register]

OUT_MAXP

This register specifies the maximum packet size (MAXP) of an

Endpoint x OUT packet. The value set for endpoint 1 is the num-

ber of received bytes divided by 8, and the value set for endpoints

0, 2, 3, and 4 is the actual number of received bytes. The CPU

can change these values using the SET_DESCRIPTOR com-

mand.

The initial value for endpoints 0, 2, 3, and 4 is 8, and the initial

value for endpoint 1 is 1. When using the endpoint 0, both USB

endpoint x IN max. packet size register (IN _MAXP) and USB end-

point x OUT max. packet size register (OUT_MAXP) are set to the

same value. Changing one register’s value effectively changes the

value of the other register as well.

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

MAXP = n for endpoints 0, 2, 3, 4

MAXP = n ✕ 8 for endpoint 1

“n” is a written value into this register.

USB endpoint x IN max. packet size register (address 005B16)

IN_MAXP

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

MAXP = n for endpoints 0, 2, 3, 4

MAXP = n ✕ 8 for endpoint 1

“n” is a written value into this register.

USB endpoint x OUT max. packet size register (address 005C16)

OUT_MAXP

Fig. 49 Structure of USB endpoint x IN max. packet size register

Fig. 50 Structure of USB endpoint x OUT max. packet size register

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