参数资料
型号: MC68HC05C8AMFB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 81/116页
文件大小: 781K
代理商: MC68HC05C8AMFB
MC68HC05C8A MC68HCL05C8A MC68HSC05C8A Data Sheet, Rev. 5.1
Freescale Semiconductor
67
Chapter 11
Operating Modes
11.1 Introduction
The microcontroller unit (MCU) has two modes of operation: user mode and self-check mode. Table 11-1
shows the conditions required to enter into each mode, where V
TST = 2 x VDD.
11.2 User Mode
In user mode, the address and data buses are not available externally, but there are three 8-bit
input/output (I/O) ports and one 7-bit input-only port. This mode allows the MCU to function as a
self-contained microcontroller, with maximum use of the pins for on-chip peripheral functions. All address
and data activity occurs within the MCU. User mode is entered on the rising edge of RESET if the IRQ
pin is within normal operating range.
The user mode pinout is shown in Figure 11-1.
Table 11-1. Operating Mode Conditions
RESET
IRQ
TCAP
Mode
VSS to VDD
User
VTST
VDD
Self-Check
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