MC68HC11EA9 Datasheet, PDF (24/58 Pages) Motorola, Inc – 8 BIT HCMOS SINGLE CHIP MICROCONTOROLLER WITH A/D CONVERTER

Freescale Semiconductor, Inc.
CR[1:0]
00
01
10
11
Table 8 COP Timer Rate Selection
Rate
Selected
2¹⁵ ÷ E
2¹⁷ ÷ E
2¹⁹ ÷ E
2²¹ ÷ E
Period Length
E = 1.0 MHz E = 2.0 MHz E = 3.0 MHz
32.768 ms 16.384 ms 10.923 ms
131.072 ms 65.536 ms 43.691 ms
524.288 ms 262.140 ms 174.76 ms
2.097 s
1.049 s 699.05 ms
COPRST — Arm/Reset COP Timer Circuitry
$103A
BIT 7
6
5
4
3
2
1
BIT 0
7
6
5
4
3
2
1
0
RESET:
0
0
0
1
0
0
0
0
Write $55 to COPRST to arm COP watchdog circuit. Write $AA to COPRST to reset COP watchdog
circuit.
HPRIO — Highest Priority I-Bit Interrupt and Miscellaneous
$103C
RESET:
BIT 7
RBOOT*
—
6
SMOD*
—
5
MDA*
—
4
IRVNE
0
3
PSEL3
0
2
PSEL2
1
1
PSEL1
0
BIT 0
PSEL0
1
*RBOOT, SMOD, and MDA reset depend on power-up initialization mode and can only be written in
special mode.
RBOOT — Read Bootstrap ROM
Refer to 4.4 Bootstrap Mode
SMOD — Special Mode Select
Refer to 4.5 Mode Selection
MDA — Mode Select A
Refer to 4.5 Mode Selection
IRVNE — Internal Read Visibility/Not E
Refer to 4.5 Mode Selection
PSEL[3:0] — Priority Select Bit 4 through Bit 0
Can be written only while the I-bit in the CCR is set (interrupts disabled). These bits select one interrupt
source to be elevated above all other I-bit related sources.
MC68HC11EA9
24
For More Information On This Product,
MC68HC11EA9TS/D
Go to: www.freescale.com