HMS81C2012A Datasheet, PDF (45/107 Pages) List of Unclassifed Manufacturers – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

HMS81C2012A/2020A
CKCTLR
[2:0]
000
001
010
011
100
101
110
111
Source clock
f_XIN÷8
f_XIN÷16
f_XIN÷32
f_XIN÷64
f_XIN÷128
f_XIN÷256
f_XIN÷512
f_XIN÷1024
Interrupt (overflow) Period (ms)
@ f_XIN = 4MHz
0.512
1.024
2.048
4.096
8.192
16.384
32.768
65.536
Table 10-1 Basic Interval Timer Interrupt Time
CKCTLR
76543210
- WAKEUP RCWDT WDTON B_BT_TC_CLL _{BTS2 BTS1 BTS0}
ADDRESS: 0EC_H
INITIAL VALUE: -001 0111_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:
010:
011:
100:
101:
110:
111:
ffffffff_{XXXXXXXXIIIIIIIINNNNNNNN}
÷
÷
÷
÷
÷
÷
÷
÷
8
16
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.
0: Operate as a 7-bit general timer
1: Enable Watchdog Timer operation
See the section “Watchdog Timer”.
0: Disable Internal RC Watchdog Timer
1: Enable Internal RC Watchdog Timer
0: Disable Wake-up Timer
1: Enable Wake-up Timer
BITR
76543210
BTCL
8-BIT FREE-RUN BINARY COUNTER
ADDRESS: 0EC_H
INITIAL VALUE: Undefined
Figure 10-2 BITR: Basic Interval Timer Mode Register
Example 1:
Basic Interval Timer Interrupt request flag is generated
every 4.096ms at 4MHz.
:
LDM
SET1
EI
:
CKCTLR,#03H
BITE
Example 2:
Basic Interval Timer Interrupt request flag is generated
every 1.024ms at 4MHz.
:
LDM
SET1
EI
:
CKCTLR,#01H
BITE
SEP. 2004 Ver 2.00
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