参数资料
型号: MC68HC05C12ACB
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
封装: SHRINK, PLASTIC, DIP-42
文件页数: 148/156页
文件大小: 756K
代理商: MC68HC05C12ACB
MC68HC05C12A Rev. 3.0
General Release Specification
MOTOROLA
Operating Modes
91
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Release Specification — MC68HC05C12A
Section 11. Operating Modes
11.1 Contents
11.2 Introduction
The 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.
11.3 User Mode
In user mode, the address and data buses are not available externally,
but there are three 8-bit 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.
Table 11-1. Operating Mode Conditions
RESET
IRQ
TCAP
Mode
VSS to VDD
User
VTST
VDD
Self-Check
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