Rev. 2.0, 11/00, page 290 of 1037
12.1.2
Block Diagram
Figure 12.1 shows a block diagram of the Timer A.
[Legend]
TMA
32 kHz
Crystal oscillator
Overflowing of
the interval
timer
System
clock
w
w/128
/16384, /8192,
/4096, /1024,
/512, /256,
/64, /16
TCA
: Timer mode register A
: Timer counter A
Note:
*
Selectable only when the prescaler W output ( w/128) is
working as the input clock to the TCA.
Prescaler S
(PSS)
Interrupting
circuit
Prescaler unit
Prescaler W
(PSW)
TCA
1/4
TMA
Interrupt
requests
Internal data bus
8
*
64
*
128
*
256
*
Figure 12.1 Block Diagram of the Timer A
12.1.3
Register Configuration
Table 12.1 shows the register configuration of the Timer A.
Table 12.1 Register configuration
Name
Abbrev.
R/W
Size
Initial Value
Address
*
Timer mode register A
TMA
R/W
Byte
H'30
H'FFBA
Timer counter A
TCA
R
Byte
H'00
H'FFBB
Note:
*
Lower 16 bits of the address.
Содержание Hitachi H8S/2191
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Страница 639: ...Rev 2 0 11 00 page 612 of 1037 28 1 2 Block Diagram Figure 28 1 shows a block diagram of the servo circuits...
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