UPD70208H Datasheet, PDF (30/110 Pages) NEC – V40HLTM, V50HLTM 16/8, 16-BIT MICROPROCESSOR

µPD70208H, 70216H
9. TCU (TIMER/COUNTER UNIT)
The TCU incorporates 3 counters, and can be used as a timer, event counter, rate generator, etc. Functionally it is a
subset of the µPD71054.
9.1 FEATURES
• ^{3 × 16-bit counters}
• ^{Six programmable count modes}
• ^{Binary/BCD count}
• ^{Multiple latch command}
• ^{Choice of two input clocks: internal/external}
9.2 TCU INTERNAL BLOCK DIAGRAM
TCU
IORD
IOWR
Note
Note 1
2
Selection
Signal
TCLK _CLOCK
(External)
Prescaler
TCTL0=High
TOUT0 (To INTL0)
TCTL1=High
TOUT1 (External) TCTL2 (External)
TOUT2 (External)
To INTL2/SCU
Read/Write Control
TCT #0
SW
Control Logic
TMD
(Mode
Register)
Status
Register
(8)
Status
Latch
(8)
Down Counter (16)
(16)
H(8) L(8)
Count
Register
(16)
H(8) L(8)
Count
Latch
(8)
(8)
Internal Data Bus
Notes 1. A0 or A1 (Set by a system I/O area register)
2. A1 or A2 (Set by a system I/O area register)
SW
SW
TCT #1
TCT #2
30
Data Sheet U13225EJ4V0DS00