Abov MC97F6108A - MC97 F6108 A Basic Interval Timer (BIT)

MC97F6108A User’s manual 8. Basic Interval Timer (BIT)
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8 Basic Interval Timer (BIT)
MC97F6108A has a free running 8-bit Basic Interval Timer (BIT). BIT generates the time base for
watchdog timer counting, and provides a basic interval timer interrupt (BITF).
BIT of MC97F6108A features the followings:
 During Power On, BIT gives a stable clock generation time
 On exiting Stop mode, BIT gives a stable clock generation time
 As a timer, BIT generates a timer interrupt.
8.1 BIT block diagram
In this section, basic interval timer of MC97F6108A is described in a block diagram.
BITR (8-bit COUNT)
BIT_CLK
BIT Interrupt Generator
BIT Out Generator
BIT Interrupt Flag
BIT_OUT
(WDT clock source)
BIT_CLK
0 1 2 3
4
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
BITR
BIT_Int_Flag
BIT_Out
 BPD[2:0] = 001b
BCK[1:0] BPD[2:0]
1/2048
1/256
1/16
1/2
fSYS fWDTRC
BWDTRC
Figure 24. Basic Interval Timer Block Diagram
8.2 BIT register map
Table 11. Basic Interval Timer Register Map
Name
Address
Direction
Default
Description
BCCR
8BH
R/W
05H
Basic Interval Timer Clock Control Register
BITR
8CH
R
00H
Basic Interval Timer Register