1. Open the “Options for Target” window 2. Set the APROM and SPROM output file on User page. (1) Check the “Run #2” (2) Key in the following statement: ..\..\..\..\Library\Startup\exe\hex2bin.exe .\output\@L.hex 0x0 0x1000 0xFF80 0x80 3. Set the Flash Programming option on Utilities page (1) Press t...

Introduction: Perform the code optimization can reduce code size and improve performance. Generally, it will be trade-off between reduce code size and improve performance. 1. During developing phase To prevent the assembly code changed by compiler, do not select any optimize function during developi...

Introduction: (1) Use watchpoint under debug mode in Keil μVision or IAR EWARM. (2) Watchpoint stops the CPU when a specified data access occurs and any specified expression becomes true. Scenario: (1) Debugging memory access status (2) Debugging parameters with unexpected changes Keil μVision: (1) ...

System Reset Status Register (SYS_RSTSTS) provides specific information for software to identify the happened reset source of chip. There are two ways for checking the reset flag: 1. Call specific API “SYS_GetResetSrc()” in the project 2. Use System Viewer to check “SYS_RSTSTS” register value in Deb...

Function: System Viewer is a helpful tool to check register status in KEIL debug mode (1) Monitors register value in real-time (2) Changes register value and becomes effective immediately Scenario: (1) When peripheral does not work as user expected, System Viewer can help user to monitor the registe...

On interrupt, user must to be pushed the current SFRS value to the stack. Also on a return from interrupt, the stack is popped to the SFRS register.

Keil C51：


Note: push_(SFRS)以及_pop_(SFRS) are defined in the file.

IAR EW8051：

Note: __sfr __no_init volatile unsigned char SFRS @ 0x91;

The following table lists the chip series that supports the function mapped interrupt vector table to SRAM. For related illustration and introduction, please refer to the FMC section or VTOR register on Technical Reference Manual (TRM).

Keil can turn off the peripheral clock in Debug mode to achieve the effect of stopping the Timer in a single-step. However, after this setting is made, the peripherals will have no action during single-step execution such as PWM output. To suspend the Timer in Debug mode, please follow the steps bel...

The pin arrangement, pin function and package size of the MS51FB9AE in the MS51 series are fully compatible with those of the N76E003AT20. Therefore, the MS51FB9AE can be directly used instead of the N76E003AT20 without modified any schematics.

To use UART RX Time Out interrupt, take UART0 as an example. When UART0 is initialized, call UART_SetTimeoutCnt to set the RX Time Out time, as shown below:

The RX Time Out setting has a valid value 40~255. The detailed description is as follows: