GMS81C7216 Datasheet, PDF (45/121 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C7208/7216
WW W WW
76543210
CKCTLR -
-
- BCK BBTTCCLL BTS2 BTS1 BTS0
ADDRESS: 0F4_H
INITIAL VALUE: ---0 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” and count up again.
This bit becomes to “0” automatically after one machine cycle.
For the test purpose.
This bit must be cleared to “0” for normal operation,
otherwise BIT clock source is form sub-clock.
BITR
RRR RRRRR
76543210
BTCL
8-BIT FREE-RUN BINARY COUNTER
ADDRESS: 0F4_H
INITIAL VALUE: Undefined
Figure 12-2 BITR: Basic Interval Timer Mode Register
Example 1:
Interrupt request flag is generated every 8.192ms at 4MHz.
:
LDM
SET1
EI
:
CKCTLR,#0CH
BITE
FEB. 2005 Ver 1.04
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