參數(shù)資料
型號: MC68HC08KH12A
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 37/178頁
文件大?。?/td> 925K
代理商: MC68HC08KH12A
MC68HC08KH12A Data Sheet, Rev. 1.1
Freescale Semiconductor
37
Chapter 5
Configuration Register (CONFIG)
5.1 Introduction
This section describes the configuration register (CONFIG). The configuration register enables or
disables the following options:
Stop mode recovery time (32 CGMXCLK cycles or 4096 CGMXCLK cycles)
STOP instruction
Computer operating properly module (COP)
COP reset period (COPRS), (2
13
–2
4
)
×
CGMXCLK or (2
18
–2
4
)
×
CGMXCLK
5.2 Functional Description
The configuration register is used in the initialization of various options. The configuration register can be
written once after each reset. All of the configuration register bits are cleared during reset. Since the
various options affect the operation of the MCU it is recommended that this register be written immediately
after reset. The configuration register is located at $001F. The configuration register may be read at
anytime.
NOTE
The CONFIG register is a special register containing one-time writable
latches after each reset. Upon a reset, the CONFIG register defaults to the
predetermined settings as shown in
Figure 5-1
.
SSREC — Short stop recovery bit
SSREC enables the CPU to exit stop mode with a delay of 32 CGMXCLK cycles instead of a 4096
CGMXCLK cycle delay.
1 = Stop mode recovery after 32 CGMXCLK cycles
0 = Stop mode recovery after 4096 CGMXCLK cycles
NOTE
Exiting stop mode by pulling reset will result in the long stop recovery.
If using an external crystal, do not set the SSREC bit.
Address: $001F
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
SSREC
COPRS
STOP
COPD
Write:
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Figure 5-1. Configuration Register (CONFIG)
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