EM77950
BB Controller
7.3.7 Pull-up Resistance Control Registers for Ports A~F –
PUCA~PUCF (0x8C ~ 0x91)
Each bit of PUCX is used to control the pull-up resistors attached to its corresponding
pin respectively. The theoretical value of the resistor is 64 KΩ. However, due to
process variation, ±35% variation in resistance must be taken into consideration.
PUCX:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PUCX7
PUCX6
PUCX5
PUCX4
PUCX3
PUCX2
PUCX1
PUCX0
0 : Pull-up Resistors disconnected
1 : Pull-up Resistors attached
7.3.8 Open Drain Control Registers of Port B/Port C –
ODCB/ODCC (0x92/0x9A)
ODCB/ODCC: Open drain control of Port B/Port C.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OPCX7
OPCX6
OPCX5
OPCX4
OPCX3
OPCX2
OPCX1
OPCX0
0 : Open drain disable
1 : Open drain enable
7.3.9 Timer Clock Counter Controller – TCCC (0x93)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
-
-
-
-
TCCS0
PSR2
PSR1
PSR0
Bit 0 ~ 2 (PSR0 ~ PSR2): Prescaler for TCC.
PSR2
PSR1
PSR0
Clock Rate
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1:2
1:4
1:8
1:16
1:32
1:64
1:128
1:256
Bit 3 (TCCS0): Clock Source Select.
TCCS0
Clock Source
0
1
Selected PLL Clock Source
Selected IRC Clock Source
Bits 4 ~ 7 are reserved.
34 •
Product Specification (V1.0) 10.09.2007
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
