参数资料
型号: MC68HC805P18MP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, EEPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 95/144页
文件大小: 1292K
代理商: MC68HC805P18MP
Advance Information
MC68HC(8)05P18 — Rev. 2.0
54
Operating Modes
MOTOROLA
Operating Modes
6.3 User Modes
The MC68HC(8)05P18 has two modes of operation available to the
user:
User mode
Bootloader mode
The mode of operation is determined by the voltages on the IRQ and
PD7/TCAP pins on the rising edge of the external RESET pin. Table 6-1
shows the condition required to go into each mode.
6.3.1 User Mode
The user 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 and is not
available externally. User mode is entered on the rising edge of RESET,
if the IRQ pin is within the normal operating voltage range. In the user
mode, there is an 8-bit input/output (I/O) port, a second 8-bit I/O port
shared with the analog-to-digital (A/D) subsystem, one 3-bit I/O port
shared with the serial input/output port (SIOP), and a 2-bit I/O port
shared with the16-bit timer subsystem.
Table 6-1. Operating Mode Conditions
RESET
IRQ
TCAP
Mode
0–5 V
User
2 x VDD
5 V
Bootloader
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For More Information On This Product,
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