Maxim Integrated 3-4
MAX31782 User’s Guide
Revision 0; 8/11
3.1 System Register Bit Descriptions
3.1.1 Accumulator Pointer Register (AP, 8h[0h])
Initialization: This register is cleared to 00h on all forms of reset.
Access: Unrestricted direct read/write access.
3.1.2 Accumulator Pointer Control Register (APC, 8h[1h])
Initialization: This register is cleared to 00h on all forms of reset.
Access: Unrestricted direct read/write access.
BIT FUNCTION
AP.[3:0]
Active Accumulator Select. These bits select which of the 16 accumulator registers are used for arithmetic and
logical operations. If the APC register has been set to perform automatic increment/decrement of the active
accumulator, this setting is automatically changed after each arithmetic or logical operation. If a ‘MOVE AP,
Acc’ instruction is executed, any enabled AP inc/dec/modulo control takes precedence over the transfer of Acc
data into AP.
AP.[7:4] Reserved. All reads return 0.
BIT FUNCTION
APC.[2:0]
(MOD[2:0])
Accumulator Pointer Auto Increment/Decrement Modulus. If these bits are set to a nonzero value, the accumula-
tor pointer (AP[3:0]) is automatically incremented or decremented following each arithmetic or logical operation.
The mode for the auto increment/decrement is determined as follows:
MOD[2:0] AUTO INCREMENT/DECREMENT MODE
000 No auto increment/decrement (default)
001 Increment/decrement AP[0] modulo 2
010 Increment/decrement AP[1:0] modulo 4
011 Increment/decrement AP[2:0] modulo 8
100 Increment/decrement AP modulo 16
101 to 111 Reserved (modulo 16 when set)
APC.[5:3] Reserved. All reads return 0.
APC.6 (IDS)
Increment/Decrement Select. If this bit is set to 0, the accumulator pointer AP is incremented following each
arithmetic or logical operation according to MOD[2:0]. If this bit is set to 1, the accumulator pointer AP is decre-
mented following each arithmetic or logical operation according to MOD[2:0]. If MOD[2:0] is set to 000, the set-
ting of this bit is ignored.
APC.7 (CLR)
AP Clear. Writing this bit to 1 clears the accumulator pointer AP to 0. Once set, this bit is automatically reset to 0
by hardware. If a ‘MOVE APC, Acc’ instruction is executed requesting that AP be set to 0 (i.e., CLR = 1), the AP
clear function overrides any enabled inc/dec/modulo control. All reads from this bit return 0.
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