T89C5115 ATMEL Corporation, T89C5115 Datasheet - Page 16

• Manufacturer Part Number: T89C5115
• Description: Low Pin Count 8-bit MCU with A/D Converter and 16-Kbytes of Flash Memory
• Manufacturer: ATMEL Corporation

Register
16
T89C5115
Table 12. CKCON Register
CKCON (S:8Fh)
Clock Control Register
Notes:
Reset Value = x000 0000b
Number
Bit
7
–
7
6
5
4
3
2
1
0
1. This control bit is validated when the CPU clock bit X2 is set; when X2 is low, this bit
has no effect.
Mnemonic Description
WDX2
PCAX2
WDX2
T2X2
T1X2
T0X2
SIX2
Bit
X2
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
WatchDog clock
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
Programmable Counter Array clock
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
Enhanced UART clock (MODE 0 and 2)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
Timer2 clock
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
Timer1 clock
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
Timer0 clock
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
CPU clock
Clear to select 12 clock periods per machine cycle (STD mode) for CPU and all
the peripherals.
Set to select 6 clock periods per machine cycle (X2 mode) and to enable the
individual peripherals "X2"bits.
PCAX2
5
(1)
(1)
(1)
SIX2
(1)
4
T2X2
3
(1)
(1)
T1X2
2
T0X2
1
4128A–8051–04/02
X2
0