HMS87C5216 ETC1 [List of Unclassifed Manufacturers], HMS87C5216 Datasheet - Page 37

• Manufacturer Part Number: HMS87C5216
• Description: CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

(2) Input clock selection of B.I.T
The input clock of B.I.T can be selected from the prescaler within
a range of 2us to 256us by clock input selection bits
(BTS2~BTS0). (at fex = 4MHz). In reset state, or power on reset,
BTS2=``1``, BTS1=``1``, BTS0=``1`` to secure the longest oscil-
lation stabilization time. B.I.T can generate the wide range of ba-
(3) Reading Basic Interval Timer
By reading of the Basic Interval Timer Register (BITR), we can
read counter value of B.I.T. Because B.I.T can be cleared or read,
the spending time up to maximum 65.5ms can be available. B.I.T
SEP. 2004 Ver 1.01
Figure 12-3 Basic Interval Timer Interrupt Time
Figure 12-2 BTCL mode of B.I.T
CKCTLR
CKCTLR
BTS2
7
7
0
0
0
0
1
1
1
1
-
-
BTS1
0
0
1
1
0
0
1
1
-
-
WDTON
WDTON
BTS0
0
1
0
1
0
1
0
1
Clock Control Register
Clock Control Register
ENPCK
ENPCK
B.I.T. Input clock
PS10 (256us)
PS9 (128us)
PS6 (16us)
PS7 (32us)
PS8 (64us)
PS3 (2us)
PS4 (4us)
PS5 (8us)
BTCL
BTCL
BTCL
0
1
sic interval time interrupt request (IFBIT) by selecting prescaler
output. Interrupt interval can be selected to kinds of interval time
as shown in
Figure 12-3.
is read-only register. If B.I.T register is written, then CKCTLR
register with same address is written.
BTS2
BTS2
Automatically cleared, after one cycle
Standby release time
BTS1
BTS1
16,384 us
32,768 us
65,536 us
1,024 us
2,048 us
4,096 us
8,192 us
512 us
Periphral clock
free-run
BTS0
BTS0
0
0
W <00C7 h>
W <00C7 h>
HMS87C5216