Texas Instruments MSP430x4xx - Manual (Page 207)

Basic Timer1 Introduction
11-7 Basic Timer1
BTCTL, Basic Timer1 Control Register
7 6 5 4 3 2 1 0
BTSSEL BTHOLD BTDIV BTFRFQx BTIPx
rw rw rw rw rw rw rw rw
BTSSEL Bit 7 BTCNT2 clock select. This bit, together with the BTDIV bit, selects the
clock source for BTCNT2. See the description for BTDIV.
BTHOLD Bit 6 Basic Timer1 Hold.
0
BTCNT1 and BTCNT2 are operational
1 BTCNT1 is held if BTDIV=1
BTCNT2 is held
BTDIV Bit 5 Basic Timer1 clock divide. This bit together with the BTSSEL bit, selects
the clock source for BTCNT2.
BTSSEL BTDIV BTCNT2 Clock Source
0 0 ACLK
0 1 ACLK/256
1 0 SMCLK
1 1 ACLK/256
BTFRFQx Bits
4−3 f
LCD
frequency. These bits control the LCD update frequency.
00 f
ACLK
/32
01 f
ACLK
/64
10 f
ACLK
/128
11 f
ACLK
/256
BTIPx Bits
2−0 Basic Timer1 Interrupt Interval.
000 f
CLK2
/2
001 f
CLK2
/4
010 f
CLK2
/8
011 f
CLK2
/16
100 f
CLK2
/32
101 f
CLK2
/64
110 f
CLK2
/128
111 f
CLK2
/256