UPD789304 Datasheet, PDF (19/64 Pages) NEC – 8-BIT SINGLE-CHIP MICROCONTROLLER

Figure 5-4. Block Diagram of Timer 40 (TM40)
8-bit timer mode control
register 40 (TMC40)
TCE40 TCL402 TCL401 TCL400 TMD401 TMD400 TOE40
Internal bus
8-bit compare
register H40 (CRH40)
Carrier generator output
control register 40 (TCA40)
8-bit compare
register 40 (CR40)
RMC40 NRZB40 NRZ40
Decoder
Selector
TMI40/P31/
INTP1/TO30
fCLK/2³
fCLK/2⁷
TMI/2
TMI/2²
TMI/2³
Match
8-bit timer counter 40 (TM40)
Clear
Carrier generator mode
PWM mode
OVF
Cascade connection mode
F/F
Output control circuit^Note
Reset
To Figure 5-3 (D)
Count operation start signal to timer 30
(during cascade connection mode)
To Figure 5-3 (E)
TM40 timer counter match signal
(during cascade connection mode)
From Figure 5-3 (G)
Timer counter match signal from timer 30
(during carrier generator mode)
TO40/P32/INTP2
To Figure 5-3 (C)
Carrier clock (during carrier generator mode)
or timer 40 output signal
(during mode other than carrier generator mode)
To Figure 5-3 (A)
Bit 7 of TM40
(during cascade connection mode)
Internal reset signal
INTTM40
To Figure 5-3 (B)
Timer 40 interrupt request signal
count clock input
signal to TM30
Note For details, see Figure 5-5.
Remark fCLK: fX or fCC
From Figure 5-3 (F)
TM30 match signal
(during cascade connection mode)