upd75212a Renesas Electronics Corporation., upd75212a Datasheet - Page 22

• Manufacturer Part Number: upd75212a
• Description: 4-bit Single-chip Microcomputer
• Manufacturer: Renesas Electronics Corporation.

22
5.6
generator. The timer/pulse generator has the following functions.
Note
f
(Set to "1")
X
Frequency
Divider
TPGM3
The PD75212A incorporates one channel of timer/pulse generator which can be used as a timer or a pulse
(a)
(b)
If pulse output is not necessary, the PPO pin can be used as a 1-bit output port.
TPGM1
TIMER/PULSE GENERATOR
1/2
Functions available in the timer mode
Functions available in the PWM pulse generation mode
If the STOP mode is set while the timer/pulse generator is in operation, miss-operation may result.
To prevent that from occurring, preset the timer/pulse generator to the stop state using its mode
register.
14-bit accuracy PWM pulse output to the PPO pin (Used as a digital-to-analog converter and applicable
Fixed time interval (
8-bit interval timer operation (IRQTPG generation) enabling the clock source to be varied at 5 levels
Square wave output to PPO pin
to tuning)
Prescalar Select Latch (5)
Fig. 5-5 Timer/Pulse Generator Block Diagram (Timer Mode)
Modulo Register L (8)
2
f
XX
15
8
= 7.81 ms : at 4.19 MHz operation) interrupt generation
Clear
MODL
CP
Internal Bus
Modulo Register H (8)
Modulo Latch H (8)
Count Register (8)
Comparator (8)
8
8
8
Clear
Match
MODH
T F/F
Set
TPGM4TPGM5 TPGM7
Selector
INTTPG
IRQTPG
Set Signal
PD75212A
Output Buffer
PPO