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| 型號(hào)： | MC68HC08GP8AMFB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 17/126頁(yè) |
| 文件大小： | 4243K |
| 代理商： | MC68HC08GP8AMFB |
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MC68HC08GP8A
Data Sheet
MOTOROLA
Mask Option Registers (MOR1 and MOR2)
113
Data Sheet — MC68HC08GP8A
Section 11. Mask Option Registers (MOR1 and MOR2)
11.1 Introduction
The two mask option registers at $001E and $001F (see Figure 11-1 and
Figure 11-2) are read-only registers. They are defined by mask options
(hard-wired connections) specified at the same time as the read-only memory
(ROM) code submission.
11.2 Mask Option Registers
TMBCLKSEL — Timebase Clock Select Bit
TMBCLKSEL enables an enable of the extra divide-by-128 prescaler in the
timebase module. Setting this bit enables the extra prescaler and clearing this
bit disables it. Refer to Table 17-1. Timebase Divider Selection for timebase
divider selection details
1 = Enables extra divide-by-128 prescaler in timebase module
0 = Disables extra divide-by-128 prescaler in timebase module
OSCSTOPENB— Oscillator Stop Mode Enable Bar Bit
OSCSTOPENB enables the oscillator to continue operating during stop mode.
Setting the OSCSTOPENB bit allows the oscillator to operate continuously even
during stop mode. This is useful for driving the timebase module to allow it to
generate periodic wakeup while in stop mode. (See 9.5 Clock Generator
Module (CGM) subsection 9.5.2 Stop Mode.)
1 = Oscillator enabled to operate during stop mode
0 = Oscillator disabled during stop mode (default)
SCIBDSRC — SCI Baud Rate Clock Source Bit
SCIBDSRC controls the clock source used for the SCI. The setting of this bit
affects the frequency at which the SCI operates.
1 = Internal data bus clock used as clock source for SCI
0 = External oscillator used as clock source for SCI
Address:
$001E
Bit 7
6
54
32
1
Bit 0
Read:
0
TMBCLKSEL OSCSTOPENB SCIBDSRC
Write:
Reset:
Mask defined
= Unimplemented
Figure 11-1. Mask Option Register 2 (MOR2)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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