EM77950 datasheet(42/102 Pages) EMC

42 / 102 page

EM77950

BB Controller

•

Product Specification (V1.0) 10.09.2007

(This specification is subject to change without further notice)

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 K

Ω. 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

: Pull-up Resistors disconnected

: 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

: Open drain disable

: 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

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

Selected PLL Clock Source

Selected IRC Clock Source

Bits 4 ~ 7

are reserved.

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