UPD789304 Datasheet, PDF (18/64 Pages) NEC – 8-BIT SINGLE-CHIP MICROCONTROLLER

Figure 5-3. Block Diagram of Timer 30 (TM30)
8-bit timer mode
control register 30
(TMC30)
TCE30 TCL301 TCL300 TMD300 TOE30
Internal bus
P30
output latch
PM30
Bit 7 of TM40
(from Figure 5-4 (A))
fCLK/2⁴
fCLK/2⁸
Timer 40 interrupt request signal
(from Figure 5-4 (B))
Carrier clock
(during carrier generator mode)
or timer 40 output signal
(during mode other than carrier generator mode)
(from Figure 5-4 (C))
Remark fCLK: fX or fCC
Selector
Decoder
8-bit compare
register 30 (CR30)
Match
8-bit timer counter 30
(TM30)
Clear
OVF
TO30/P31/
INTP1/TMI40
Internal reset signal
From Figure 5-4 (D)
Count operation start signal
(during cascade connection mode)
Selector
Cascade connection mode
INTTM30
From Figure 5-4 (E)
Timer 40 match signal
(during cascade connection mode)
To Figure 5-4 (G)
Timer 30 match signal
(during carrier generator mode)
To Figure 5-4 (F)
Timer 30 match signal
(during cascade connection mode)