參數(shù)資料
型號: MC68HC05C9AMB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
封裝: SHRINK, PLASTIC, DIP-42
文件頁數(shù): 21/124頁
文件大?。?/td> 774K
代理商: MC68HC05C9AMB
MC68HC05C9A Advance Information Data Sheet, Rev. 5.1
Freescale Semiconductor
117
Appendix C
Self-Check Mode
C.1 Introduction
This appendix describes the self-check mode.
C.2 Self-Check Mode
Self-check mode is entered upon the rising edge of RESET if the IRQ pin is at Vtst and the TCAP pin is
at logic 1.
C.2.1 Self-Check Tests
The self-check read-only memory (ROM) at mask ROM location $3F00–$3FEF determines if the
microcontroller unit (MCU) is functioning properly.
These tests are performed:
1.
Input/output (I/O) — Functional test of ports A, B, and C
2.
Random-access memory (RAM) — Counter test for each RAM byte
3.
Timer — Test of counter register and OCF bit
4.
Serial communications interface (SCI) — Transmission test; checks for RDRF, TDRE, TC, and FE
flags
5.
ROM — Exclusive OR with odd ones parity result
6.
Serial peripheral interface (SPI) — Transmission test; checks for SPIF and WCOL flags
The self-check circuit is shown in Figure C-1.
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