GMS81C50 Datasheet, PDF (42/99 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCONTROLLERS

HYUNDAI
GMS81C50 Series
10. CLOCK GENERATOR
Clock generating circuit consists of Clock Pulse Generator
(C.P.G), Prescaler, Basic Interval Timer (B.I.T) and Watch
Dog Timer. The clock applied to the Xin pin divided by
two is used as the internal system clock.
fex
OSC
Circuit
fcpu
C.P.G
Internal System Clock
PRESCALER
PS1
ENPCK
8
MUX
0
7
B.I.T (8)
IFBIT
0
5
WDT (6)
WDTCL
3
Peripheral
BTCL
CKCTLR 0 1 2 3 4 5
Internal Data Bus
COMPARATOR
WDTON
6
WDTR
6
0
56
IFWDT
To Reset
Circuit
Figure 10-1 Block Diagram of Clock Generator
Prescaler consists of 12-bit binary counter. The clock sup-
plied from oscillation circuit is input to prescaler (fex).
The divided output from each bit of prescaler is provided
to peripheral hardware.
fex
ENPCK
PS1 PS2 PS3 PS4 PS5 PS6 PS7 PS8 PS9 PS10 PS11 PS12
B.I.T
fcpu
PS0 PS1 PS2 PS3 PS4 PS5 PS6 PS7 PS8 PS9 PS10 PS11 PS12
Peripheral
Figure 10-2 Block diagram of Prescaler
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