MC68HC08LT8 Datasheet, PDF (31/156 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 3
Configuration Register (CONFIG)
3.1 Introduction
This section describes the configuration registers, CONFIG1 and CONFIG2.
The configuration registers enable or disable these options:
• Computer operating properly module (COP)
• COP timeout period (2¹³â€“2⁴ or 2¹⁸–2⁴ CGMXCLK cycles)
• Crystal oscillators during stop mode
• Low voltage inhibit (LVI) module power
• LVI module reset
• LVI module in stop mode
• LVI module voltage trip point selection
• STOP instruction
• Stop mode recovery time (32 or 4096 CGMXCLK cycles)
• LCD frontplanes FP3–FP10 on port E
• LCD frontplanes FP11–FP18 on port D
• LCD frontplanes FP19–FP24 on port C
Addr.
Register Name
Bit 7
6
5
$001D
Read: _{STOP_}
Configuration Register 2
(CONFIG2)⁽¹⁾
Write:
XCLKEN
STOP_
XTALEN
PEE
Reset: 0
0
0
$001F
Read:
Configuration Register 1
(CONFIG1)⁽¹⁾
Write:
Reset:
COPRS
0
LVISTOP LVIRSTD
0
0
1. One-time writable register after each reset.
2. LVIT1, LVIT0, and LVIPWRD reset to 0 by a power-on reset (POR) only.
R = Reserved
4
PDE
0
LVIPWRD
0⁽²⁾
3
PCEH
0
R
0
Figure 3-1. CONFIG Registers Summary
2
1
Bit 0
PCEL
0
LVISEL1 LVISEL0
0⁽²⁾
1⁽²⁾
SSREC STOP COPD
0
0
0
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
31