MC80F0424 Datasheet, PDF (51/135 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

Preliminary
MC80F0424/0432/0448
7
CKCTLR ^ADRST
6543210
- RCWDT WDTON B_BT_TC_CL_{L BTS2 BTS1 BTS0}
ADDRESS: 0F2_H
INITIAL VALUE: 0-010111_B
Caution:
Both register are in same address,
when write, to be a CKCTLR,
when read, to be a BITR.
Basic Interval Timer source clock select
000:
001:
ff^XXIINN
÷
÷
8
16
010:
011:
100:
101:
110:
111:
ffffff_{XXXXXXIIIIIINNNNNN}
÷
÷
÷
÷
÷
÷
32
64
128
256
512
1024
Clear bit
0: Normal operation (free-run)
1: Clear 8-bit counter (BITR) to “0”. This bit becomes 0 automatically
after one machine cycle, and starts counting.
Watchdog timer Enable bit
0: Operate as 7-bit Timer
1: Enable Watchdog Timer operation
See the section “Watchdog Timer”.
RC Watchdog Selection bit
0: Disable Internal RC Watchdog Timer
1: Enable Internal RC Watchdog Timer
Address Fail Reset Selection
0: Enable Address Fail Reset
1: Disable Address Fail Reset
BITR
76543210
BTCL
8-BIT FREE-RUN BINARY COUNTER
ADDRESS: 0F2_H
INITIAL VALUE: Undefined
Figure 11-2 BITR: Basic Interval Timer Mode Register
Example 1:
Interrupt request flag is generated every 8.192ms at 4MHz.
:
LDM
SET1
EI
:
CKCTLR,#1BH
BITE
Example 2:
Interrupt request flag is generated every 8.192ms at 8MHz.
:
LDM
SET1
EI
:
CKCTLR,#1CH
BITE
MAR. 2005 Ver 0.2
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