CP80S54 Datasheet, PDF (25/47 Pages) List of Unclassifed Manufacturers – EPROM/ROM-Based 8-Bit Microcontroller Series

2.9 Configurations Word
TABLE 2.4: Configurations Word 0
bit
Name
Description
Oscillator Selection Bits
= 1, 1, 1 Æ ERC mode (external R & C) (default);
2, 1, 0
Fosc<2:0>
IOA6/OSCO pin controlled by OSCOUT configuration bit
= 1, 1, 0 Æ HF mode
= 1, 0, 1 Æ XT mode
= 1, 0, 0 Æ LF mode
= 0, 1, 1 Æ IRC mode (internal R & C);
IOA6/OSCO pin controlled by OSCOUT configuration bit
= 0, 1, 0 Æ ERIC mode (external R & internal C);
IOA6/OSCO pin controlled by OSCOUT configuration bit
Watchdog Timer Enable Bit
3
WDTEN = 1, WDT enabled (default)
= 0, WDT disabled
Code Protection Bit
4
PROTECT = 1, EPROM code protection off (default)
= 0, EPROM code protection on
Low Voltage Detector Selection Bit
= 1, 1 Æ disable (default)
6, 5
LVDT<1:0> = 1, 0 Æ enable, LVDT voltage = 2.0V, controlled by SLEEP
= 0, 1 Æ enable, LVDT voltage = 2.0V
= 0, 0 Æ enable, LVDT voltage = 3.6V
Instruction Period Selection Bits
= 1, 1 Æ four oscillator periods (default)
8, 7
OSCD<1:0> = 1, 0 Æ two oscillator periods
= 0, 1 Æ one oscillator period
= 0, 0 Æ eight oscillator periods
10, 9
RCM<1:0>
IRC/ERIC Mode Selection Bits
= 1, 1 Æ 4MHz (default)
= 1, 0 Æ 8MHz
= 0, 1 Æ 1MHz
= 0, 0 Æ 455KHz
IOA6/OSCO Pin Selection Bit for ERC/IRC/ERIC Mode
11
OSCOUT = 1, OSCO pin is selected; Instruction clock will be output (default)
= 0, IOA6 pin is selected
IOA5/RSTB Pin Selection Bit
12
RSTBIN = 1, IOA5 pin is selected (default)
= 0, RSTB pin is selected
TABLE 2.5: Configurations Word 1
bit
Name
Description
4~0
CAL<4:0> Calibration Selection Bits for IRC Mode
Power Mode Selection Bit
5
PMOD = 1, Non-power saving (default)
= 0, Power saving
Read Port Control bit for Output Pins
6
RDPORT = 1, From registers (default)
= 0, From pins
Rev0.1 Nov 30, 2005
P.25/CP80S54/S56