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參數(shù)資料
| 型號： | MC68HC05CJ4FB |
| 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, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 40/114頁 |
| 文件大?。?/td> | 4047K |
| 代理商： | MC68HC05CJ4FB |
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GENERAL RELEASE SPECIFICATION
MODES OF OPERATION
Rev. 2.1
6-1
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SECTION 6
MODES OF OPERATION
6.1 Introduction
The MC68HC05CJ4 has the following operating modes: single-chip mode (SCM)
and self-check mode. In the MC68HC705CJ4, the self-check mode becomes
bootstrap mode.
The single-chip mode allows maximum use of pins for on-chip peripheral functions.
The self-check capability of MC68HC05CJ4 provides an internal check to
determine if the device is functional.
The bootstrap loader mode is provided for EPROM programming, dumping
EPROM contents, and reading programs into the internal RAM and executing it.
This is a very versatile mode because essentially on the special purpose program
that is bootloaded into the internal RAM has no limitations.
This section also provides a description of the low-power modes.
6.2 Mode Entry
The mode entry is done at the rising edge of the RESET pin. Once the device
enters one of the four modes, the mode can be changed only by external reset not
software.
At the rising edge of the RESET pin, the device latches the states of the IRQ, PB6
and PB7 pins and places itself in the specified mode. While the RESET pin is low,
all pins are configured as single-chip mode. Table 6-1 shows the states of IRQ and
PB6:7 pins for each mode. See Figure 6-1.
Table 6-1. Mode Select Summary
Mode
RESET
IRQ
PB6
PB7
Single-Chip Mode
L or H
X
Self-Check/Bootstrap Mode
VTST
HX
VTST = 1.8 x VDD
H = VDD
L = GND
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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