M37544 Datasheet, PDF (26/68 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7544 Group
Data bus
f(XIN)/16
f(XIN)/2
On-chip oscillator clock RING
P00/CNTR1
CNTR1 active
edge switch bit
Prescaler 1 latch (8)
Timer 1 latch (8)
Prescaler 1 (8)
Rising edge detected
Falling edge detected
Timer 1 (8)
Pulse width HL
continuously
measurement mode
Period measurement mode
Data bus
Timer 1 interrupt
request bit
Timer A (low-order) latch (8)
Timer A (high-order) latch (8)
f(XIN)/16
f(XIN)/2
On-chip oscillator clock RING
Timer A (low-order) (8)
Timer A operation mode bit
Timer A count
stop bit
Fig. 26 Block diagram of timer 1 and timer A
Timer A (high-order) (8)
Timer A interrupt
request bit
Data bus
P03/TXOUT
P14/CNTR0
f(XIN)/16
f(XIN)/2
f(XIN)
Timer X count
source selection bits
CNTR0 active
edge switch bit
“0”
Pulse width _{Timer mode}
measurement _{Pulse output}
mode
mode
Prescaler X latch (8)
Prescaler X (8)
Event
counter
mode
Timer X count stop bit
“1”
Port P14
Port P14 direction
latch
register
Pulse output mode
CNTR0 active “1”
edge switch bit
“0”
Q
Toggle flip-flop T
Q
R
Port P03 latch
P03/TXOUT output valid
Port P03
direction
register
Fig. 27 Block diagram of timer X
Rev.1.04 2004.06.08 page 26 of 66
REJ03B0012-0104Z
Timer X latch (8)
Timer X (8)
Timer X
interrupt
request bit
CNTR0
interrupt
request bit
Timer X write control bit
Writing to timer X latch
Pulse output mode