UPD753036 Datasheet, PDF (29/88 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER

Figure 6-7. Timer/Event Counter Block Diagram (channel 1)
PORT1.2
8 _SET1^Note
TM1
– TM16 TM15 TM14 TM13 TM12 TM11 TM10
Decoder
Input buffer
TI1/P80
Timer/event counter
output (channel 2)
fx/2⁵
fx/2⁶
MPX
CP
From clock
generator
fx/2⁸
fx/2¹⁰
fx/2¹²
Internal bus
8
TMOD1
Modulo register (8)
8
Comparator (8)
Match
8
T1
Count register (8)
Clear
Timer operation start
16 bit timer/event counter mode
Selector
TOE1
T1
enable flag
PORT2.1 PMGB.2
P21
output latch
Port 2
input/output
mode
TOUT
F/F
Reset
P21/PTO1
Output buffer
RESET
IRQT1 set signal
Note Instruction execution
Timer/event counter match signal (channel 2)
(When 16-bit timer/event counter mode)
Timer/event counter reload signal (channel 2)
Timer/event counter comparator (channel 2)
(When 16-bit timer/event counter mode)
INTT1
IRQT1
set signal