Flash; Bypass Flash Code; External Flash - Realtek RTL8762C Hardware Instructions

Hide thumbs Also See for RTL8762C:

6 Flash

RTL8762CJ, RTL8762CK needs external flash, and available Flash is mentioned in Flash QVL.

RTL8762CJF, RTL8762CKF contains internal Flash.



If P0_3 is pulled low, the code in flash would be bypassed (not be erased) and IC would

execute Rom code when RTL8762C power on or reset.

(Note: P0_3 will be changed to Log output after power-on. It is necessary to return P0_3 to

the floating state as soon as possible after power-on, or pull P0_3 down to GND with 500ohm

series resistor.)



If P0_3 is not connected (P0_3 internally pull high by default), IC would execute flash code

when RTL8762C power on or reset. P0_3 has internal pull-high configuration.

External Flash should be connected to RTL8762CJ/CK SPIC interface. It could support 1-bit

mode (Standard SPI), 2-bit mode and 4-bit mode (QSPI). In QSP mode, P1_3 and P1_4 need to be

connected to Flash, and cannot be used as normal IO. The corresponding circuit is shown in the

figure below. Please refer to reference design for details.

For external Flash, running SPI CLK 20MHz is required during XIP. At the same time, it is

necessary to pay more attention to layout.

For FM series Flash, WP and HOLD pin do not have internal pull high. Therefore, when applying

1-bit mode, it is required to externally pull high the two pins.

As to the Flash supported by RTL8762C, please refer to the RT8762C Flash AVL document for

more details.

Figure6.1 Flash reference circuit

RTL8762C Evaluation Board User Manual

Table of Contents