Texas Instruments MSP430x4xx Computer Hardware User Manual


 
Timer_B Registers
13-21Timer_B
Timer_B Control Register TBCTL
15 14 13 12 11 10 9 8
Unused
TBCLGRPx CNTLx Unused TBSSELx
rw(0) rw(0) rw(0) rw(0) rw(0) rw(0) rw(0) rw(0)
76543210
IDx MCx Unused TBCLR TBIE TBIFG
rw(0) rw(0) rw(0) rw(0) rw(0) w(0) rw(0) rw(0)
Unused
Bit 15 Unused
TBCLGRP
Bit
14-13
TBCLx group
00 Each TBCLx latch loads independently
01 TBCL1+TBCL2 (TBCCR1 CLLDx bits control the update)
TBCL3+TBCL4 (TBCCR3 CLLDx bits control the update)
TBCL5+TBCL6 (TBCCR5 CLLDx bits control the update)
TBCL0 independent
10 TBCL1+TBCL2+TBCL3 (TBCCR1 CLLDx bits control the update)
TBCL4+TBCL5+TBCL6 (TBCCR4 CLLDx bits control the update)
TBCL0 independent
11 TBCL0+TBCL1+TBCL2+TBCL3+TBCL4+TBCL5+TBCL6
(TBCCR1 CLLDx bits control the update)
CNTLx
Bits
12-11
Counter Length
00 16-bit, TBR
(max)
= 0FFFFh
01 12-bit, TBR
(max)
= 0FFFh
10 10-bit, TBR
(max)
= 03FFh
11 8-bit, TBR
(max)
= 0FFh
Unused
Bit 10 Unused
TBSSELx
Bits
9-8
Timer_B clock source select.
00 TBCLK
01 ACLK
10 SMCLK
11 Inverted TBCLK
IDx
Bits
7-6
Input divider. These bits select the divider for the input clock.
00 /1
01 /2
10 /4
11 /8
MCx
Bits
5-4
Mode control. Setting MCx = 00h when Timer_B is not in use conserves
power.
00 Stop mode: the timer is halted
01 Up mode: the timer counts up to TBCL0
10 Continuous mode: the timer counts up to the value set by TBCNTLx
11 Up/down mode: the timer counts up to TBCL0 and down to 0000h