MAX1441 Datasheet, PDF(13/41 Page) Maxim Integrated Products – Automotive, Two-Channel Proximity and Touch Sensor

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MAX1441 Datasheet, PDF (13/41 Pages) Maxim Integrated Products – Automotive, Two-Channel Proximity and Touch Sensor

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Automotive, Two-Channel Proximity and

Touch Sensor

Table 4. Special-Purpose Registersâ Reset Values

APC

PSF

IMR

IIR

CKCN

WDCN

MSB

0000

1000

0000

1000

0000

1110

ss11

0000

LSB

0000

00s0

0000

0ss0

0000

PFX

LC0

LC1

DPC

GRL

GRS

GRH

GRXL

DP0

MSB

0000

1000

0000

0111

0000

0010

1111

0000

LSB

0000

1111

1101

0000

0100

0000

Table 5. Special-Purpose Register Bit Description

AP (00h, 08h)

Initialization

Read/Write Access

DESCRIPTION

Accumulator Pointer (8-Bit Register)

This register is cleared to 00h on all forms of reset.

Unrestricted read/write.

AP[1:0]

Active Accumulator Select Bits [1:0]. The setting of these bits activates one of the four accumulators

in the accumulator module (A) to function as the active accumulator for arithmetic and logical opera-

tions. The setting of these bits can be automatically incremented/decremented in a modulo fashion

according to the setting to the APC register.

AP[7:2]

APC (01h, 08h)

Initialization

Read/Write Access

APC[1:0]âMOD[1:0]

APC[5:2]

APC.6âIDS

Reserved. Read returns 0.

Accumulator Pointer Control (8-Bit Register)

This register is cleared to 00h on all forms of reset.

Unrestricted read/write.

Modulo Bits [1:0]. The accumulator pointer autoincrement/decrement function is activated when these

bits are set to a value other than 00b. The modulo is selected accordingly when active pointer autoincre-

ment/decrement is active.

MOD[1:0]

Reserved. Read returns 0.

MODULO

Default, no AP autoincrement/decrement

Modulo 2

Modulo 4

Reserved (modulo 4 if set)

Increment/Decrement Select. When this bit is cleared to 0, the content of AP increments after an arith-

metic or logical operation. When this bit is set to 1, the content of AP is decremented after arithmetic or

logical operation.

APC.7âCLR

AP Clear. When this bit is set to 1, the content of AP is cleared to 0. This bit automatically resets to 0

after clearing the AP register. Note if the MOVE APC, Acc instruction (980Ah) causes the CLR bit to set,

the clear operation overrides other functions (i.e., the AP autoincrement/decrement does not happen).

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