參數(shù)資料
型號: MC68HC05G3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 48/128頁
文件大?。?/td> 290K
代理商: MC68HC05G3
Page 16
MOTOROLA
Section 1: INTRODUCTION
MC68HC05G3 (705G4) Specification Rev. 1.1
SYS1/0
System Clock Select
These 2 bits select the system clock source. Upon reset, the SYS1 and SYS0
bits are initialized to zeros.
FOSCE
Fast (Main) Oscillator Enable
The FOSCE bit controls main oscillator activity. This bit should not be cleared by
the CPU when the main oscillator is selected as the system clock source.
When this bit is cleared:
1. OSC is shut down.
2. 7-bit divider at the OSC input plus 6-bit POD counter are initialized to
$0078.
3. FTUP flag is cleared.
When this bit is set:
1. Main oscillator starts again.
2. FTUP flag is set by the POD counter overflow (8072 clocks).
OPTM
Option Map Select
The OPTM bit selects one of two register maps at $0000-$000F. This bit is
cleared on reset.
0 - Main register map is selected
1 - Option map is selected
1.5
TST/VPP PIN
In the normal operation mode (SCM), this pin should be tied to VDD level.
SYS1
SYS0
DIVIDE RATIO
FREQUENCY (HZ)
OSC=
4.0M
OSC=
4.1943M
XOSC=
32.768K
0
1
0
1
0
1
OSC DIVIDED BY 2
OSC DIVIDED BY 4
OSC DIVIDED BY 64
XOSC DIVIDED BY 2
2.0M
1.0M
62.5K
----
2.0972M
1.0486M
65.536K
----
16.384K
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