Legacy-Free Keyboard/Embedded Controller with SPI and LPC Docking Interface
Table 18.5 PWM2 Speed Control Register
0x95
0x7F29
VCC1
0x00
MAILBOX INDEX
8051 ADDRESS
POWER
DEFAULT
BIT
D7
D6
R/W
D5
R/W
D4
R/W
D3
R/W
D2
R/W
D1
R/W
D0
R/W
R/W
MBX TYPE
8051 R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PWM2
PWM2 DUTY CYCLE CONTROL
PWM2
BIT NAME
CLOCK
SELECT 0
CLOCK
CONTROL
Table 18.6 PWM3 Speed Control Register
0x98
0x7F85
VCC1
0x00
MAILBOX INDEX
8051 ADDRESS
POWER
DEFAULT
BIT
D7
D6
R/W
D5
R/W
D4
R/W
D3
R/W
D2
R/W
D1
D0
R/W
R/W
R/W
R/W
MBX TYPE
8051 R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PWM3
PWM3 DUTY CYCLE CONTROL
PWM3
BIT NAME
CLOCK
SELECT 0
CLOCK
CONTROL
PWM Clock Select 0, D7
The PWM Clock Select 0 bit, D7 in the PWM Speed Control registers is used with the PWM Clock Select
1 and the PWM Clock Multiplier bits in the PWM Control register, and the Frequency Multiplier bits, to
determine the fan speed FOUT.
Note: There are separate PWM0, PWM1 and PWM2 Clock Select 1 and Clock Multiplier bits in the
PWM Control register (see Section 18.3). There is also a separate PWM3 Control Register for
PWM3 Control Select 1 and Clock Multiplier bits
The affects of the PWM Clock Select[1:0] bits are shown in Table 18.1.
SMSC LPC47N350
203
Revision 1.1 (01-14-03)
DATASHEET
SMSC [ SMSC CORPORATION ]
