Rainbow Electronics MAXQ3108 - Manual (Page 38)

MAXQ3108
Low-Power, Dual-Core Microcontroller
38 ______________________________________________________________________________________
Special Function Register Bit Descriptions (continued)
Timer 2 Capture/Compare Function Select. These bits, in conjunction with the C/T2 bit, select the
basic operating mode of timer 2. In the dual 8-bit mode of operation (T2MD = 1), the secondary
timer (T2L) always operates in compare mode.
CCF[1:0] EDGE(S)
C/T2 = 0 (TIMER
MODE)
C/T2 = 1 (COUNTER
MODE)
00 None Compare Mode Disabled
01 Rising Capture/Reload Counter
10 Falling Capture/Reload Counter
T2CFG.[2:1]: CCF[1:0]
11 Rising and Falling Capture/Reload Counter
T2CFG.3: T2MD
Timer 2 Mode Select. This bit enables the dual 8-bit mode of operation. The default reset state is
0, which selects the 16-bit mode of operation. When the dual 8-bit mode is established, the primary
timer/counter (T2H) carries all the counter/capture functionality with it while the secondary 8- bit
timer (T2L) must operate in timer compare mode, sourcing the defined internal clock.
0: 16-bit mode (default)
1: dual 8-bit mode
Timer 2 Clock Divide 2:0 Bits. These three bits select the divide ratio for the timer clock when
operating in timer mode.
T2DIV[2:0] DIVIDE RATIO
000 1
001 2
010 4
011 8
100 16
101 32
110 64
T2CFG.[6:4]: T2DIV[2:0]
111 128
T2CFG.7: T2CI
Timer 2 Clock Input Select Bit. Setting this bit enables an alternate input clock source to the timer
2 block. The alternate input clock selection is the 32kHz clock. The alternate input clock must be
sampled by the system clock, which requires that the system clock be at least 4 x 32kHz for
proper operation.
MCNT (00h, 03h) Multiplier Control Register
Initialization: This register is cleared to 0000h on all forms of reset.
Read/Write Access: Unrestricted read, write is allowed for all bits except bit 7 and 15. Bit 7 and 15 are read-only.
MCNT.0: SUS
Signed-Unsigned. This bit determines the data type of the operands. When this bit is cleared to 0,
the multiplier performs a signed operation; the operands are two’s complement values. When this
bit is set to logic 1, the multiplier performs an unsigned operation with the operands as absolute
magnitudes.
MCNT.1: MMAC Multiply-Accumulate Enable