EM6821 datasheet(21/68 Pages) EMMICRO

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EM6821

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6.6.2 Pull-up or Pull-down

For each terminal of PSP[3:0] an input pull-up (metal mask MPSPU[n]) or pull-down (metal mask MPSPD[n])

resistor can be implemented per metal mask option. Per default the two metal masks are in place, so one can

chose per software to have either a pull-up, a pull-down or no resistor. For Metal mask selection and available

resistor values refer to chapter 18.1.4

Pull-down ON : MPSPD[n] must be in place ,

AND the bit NoPdPS[n] must be ‘0’ .

Pull-down OFF: MPSPD[n] is not in place,

OR if MPSPD[n] is in place NoPdPS[n] = ‘1’ cuts off the pull-down.

OR selecting NchOpDPS[n] = ‘1’ cuts off the pull-down.

Pull-up ON *

: MPSPU[n] must be in place,

AND the bit NchOpDPS[n] must be ‘1’ ,

AND ( the bits OM[1,0] in RegSysCntl2 = ‘00’ (input mode) OR any of the port SP terminals

is in output mode with a logic ‘1’ to be driven) .

Pull-up OFF*

: MPSPU[n] is not in place,

OR if MPSPU[n] is in place NchOpDPS[n] = ‘0’ cuts off the pull-up,

OR if MPSPU[n] is in place and NchOpDPS[n] = ‘1’ then SerPData[n] = 0 cuts off the pull-up.

Figure 14. Port SP Terminal Configuration

Internal Data Bus

MUX

DR[n]

DB[n]

Read

Read OR Serial Mode

Serial Interface Outputs

(SOUT, Ready/CS and SCLK)

Parallel Output

Serial /

Parallel

Control

Read

Pd[n]

Pull-down Option

OD[n]

Nch. Open Drain

Option Register

Mode (direction

for SCLKOut

Terminal only)

Tristate

Parallel Output

Data Register

Serial Interface

Inputs (SIN

and SCLKIn)

Active

Pulldown

I / O Terminal

SP[n]

Active Pull-up

in Nch. Open

Drain Mode

Mask Option

MPSPD[n]

Mask Option

MPSPU[n]

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