at89c51ac3-s3sim ATMEL Corporation, at89c51ac3-s3sim Datasheet - Page 16

• Manufacturer Part Number: at89c51ac3-s3sim
• Description: At89c51ac3 Enhanced 8-bit Microcontroller With 64kb Flash Memory
• Manufacturer: ATMEL Corporation

Figure 5. Clock CPU Generation Diagram
16
XTAL1
XTAL2
AT89C51AC3
PCON.1
CKCON.0
PD
X2
÷
2
Hardware byte
CKCON1.0
SPIX2
CKCON.0
X2B
÷
1
0
X2
2
CKCON0.6
WDX2
÷
On RESET
÷
1
0
2
2
CKCON0.5
PCAX2
÷
1
0
0
1
2
PCON.0
IDL
CKCON0.4
SIX2
÷
1
0
2
CKCON0.3
T2X2
÷
1
0
2
CKCON0.2
T1X2
÷
1
0
2
CPU Core Clock Symbol
CKCON0.1
T0X2
1
0
CLOCK
and ADC
CPU
CPU Core
Clock
Clock Symbol
Peripheral
PERIPH
CLOCK
FT1 Clock
FPca Clock
FUart Clock
FSPIClock
FT0 Clock
FT2 Clock
4383D–8051–02/08
FWd Clock