HMS87C5216 ETC1 [List of Unclassifed Manufacturers], HMS87C5216 Datasheet - Page 34

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

HMS87C5216
11. CLOCK GENERATOR
Clock generating circuit consists of Clock Pulse Generator
(C.P.G), Prescaler, Basic Interval Timer (B.I.T) and Watch Dog
Prescaler consists of 12-bit binary counter. The clock supplied
from oscillation circuit is input to prescaler (fex). The divided
Figure 11-1 Block Diagram of Clock Generator
Figure 11-2 Block diagram of Prescaler
ENPCK
fcpu
fex
Peripheral
CKCTLR
PRESCALER
Circuit
8
OSC
PS0
ENPCK
0
3
PS1
1
PS1
PS1
MUX
2
fex
PS2
3
PS2
4
PS3
5
PS3
C.P.G
BTCL
0
PS4
Internal Data Bus
PS4
B.I.T (8)
PS5
fcpu
PS5
7
PS6
PS6
Timer. The clock applied to the Xin pin divided by two is used as
the internal system clock.
output from each bit of prescaler is provided to peripheral hard-
ware.
PS7
WDTON
PS7
0
0
COMPARATOR
PS8
PS8
WDT (6)
WDTR
9
6
Internal System Clock
PS9
PS9
5
PS10 PS11 PS12
5
WDTCL
6
PS10 PS11
6
IFBIT
To Reset
Circuit
SEP. 2004 Ver 1.01
IFWDT
PS12
Peripheral
B.I.T