Timer A
M30240 Group
Rev.1.00 Sep 24, 2003 Page 152 of 360
Figure 2.12: Set-up procedure for timer mode and pulse output function
Setting divide ratio
Can be set to 000016 to FFFF16
b7 b0
(b15) (b8)
b7 b0
Timer A0 register [Address 0387 16, 038616] TA0
Timer A1 register [Address 0389
16, 038816] TA1
Timer A2 register [Address 038B
16, 038A16] TA2
Timer A3 register [Address 038D
16, 038C16] TA3
Timer A4 register [Address 038F
16, 038E16] TA4
1 : Pulse is output (Note) (TA iOUT pin is a pulse output pin)
Selecting timer mode and functions
Timer Ai mode register (i=0 to 4) [Address 0396 16 to 039A16]
TAiMR (i=0 to 4)
Selection of timer mode
b7 b0
00010
0 (Must always be “0” in timer mode)
Count source select bit
0 0 : f
1
0 1 : f8
1 0 : f32
1 1 : Reserved
b7 b6
Note: The settings of the corresponding port register and port direction register are invalid.
Start count
Setting count start flag
Count start flag [Address 0380 16]
TABSR
Timer A0 count start flag
Timer A1 count start flag
Timer A2 count start flag
Timer A3 count start flag
Timer A4 count start flag
b7 b0
Count source period
f(XIN) : 12MHZ
b7 b6
Count
source
83.3ns
667ns
µs
00
01
10
f
1
f8
f32
Gate function select bit
0 0 :
0 1 :
b4 b3
Gate function not available (TAi IN
pin is a normal port pin)
2.67
Start count
Setting the TAiOUT drive capacity
Timer A output drive capacity register
[Address 03FB
16]
TADR
Timer A0
OUT drive capacity
Timer A1
Timer A2
Timer A3
Timer A4
b7 b0
Start count
OUT drive capacity
OUT drive capacity
OUT drive capacity
OUT drive capacity
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