Block Diagram; Register Configuration - Renesas Hitachi H8S/2194 Series Hardware Manual

12.1.2

Block Diagram

Figure 12.1 shows a block diagram of the Timer A.
32 kHz
w
Crystal oscillator
System
clock
[Legend]
TMA
TCA
Note: * Selectable only when the prescaler W output ( w/128) is
12.1.3

Register Configuration

Table 12.1 shows the register configuration of the Timer A.
Table 12.1 Register configuration
Name
Timer mode register A
Timer counter A
Note: * Lower 16 bits of the address.
Rev. 2.0, 11/00, page 290 of 1037
Prescaler W
1/4
(PSW)
w/128
/16384, /8192,
/4096, /1024,
/512, /256,
/64, /16
Prescaler S
(PSS)
Prescaler unit
: Timer mode register A
: Timer counter A
working as the input clock to the TCA.
Figure 12.1 Block Diagram of the Timer A
Abbrev. R/W
TMA R/W
TCA R
TMA
TCA
Overflowing of
the interval
timer
Interrupting
circuit
Size Initial Value
Byte H'30
Byte H'00
Interrupt
requests
Address*
H'FFBA
H'FFBB