UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 163

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

(1)
(2)
10-bit up/down counter (TM7)
TM7 is a 10-bit up/down counter that counts count pulses in synchronization with the rising edge of the
count clock. When the timer starts, the number of count pulse count is incremented from 0, and when
the value preset to compare register 3 (CM3) and TM7 count value match, it is switched to the count down
operation.
An underflow signal is generated if the value becomes 000H during the count down operation and interrupt
request signal INTTM7 is generated. When an underflow occurs, it is switched from the count down
operation to the count up operation. INTTM7 is normally generated at every underflow but the number
of occurrences can be divided by the IDEV0 to IDEV2 bits of inverter timer control register 7 (TMC7).
TM7 cannot be read/written.
The cycle of TM7 is controlled by CM3.
The count clock can be selected from 6 types: f
RESET input or clearing the CE7 bit of TMC7 sets TM7 to 000H.
10-bit compare registers 0 to 2 (CM0 to CM2)
CM0 to CM2 are 10-bit compare registers that always compare their own value with that of TM7, and if
they match, the contents of the flip-flops are changed.
Each of CM0 to CM2 are provided with a buffer register (BFCM0 to BFCM2), so that the contents of the
buffer can be transferred to CM0 to CM2 at the timing of interrupt request signal INTTM7 generation.
A write operation to CM0 to CM2 is possible only while TM7 is stopped.
To set the output timing, write data to BFCM0 to BFCM3.
RESET input or clearing the CE7 bit of TMC7 sets these registers to 000H.
f
f
f
f
X
X
X
X
f
X
/2
/2
/2
/2
/2
f
X
2
3
4
5
BFCM3
BFCM0
BFCM1
BFCM2
Figure 8-1. Block Diagram of 10-Bit Inverter Control Timer
CM3
CM0
CM1
CM2
TM7
10
CHAPTER 8 10-BIT INVERTER CONTROL TIMER
f
X
RTM0
User’s Manual U13029EJ7V1UD
DTIME
DTM0
DTM1
DTM2
8
X
, f
INTTM7
X
/2, f
X
/4, f
generator
Pulse
X
/8, f
Output off function by
external input (TOFF7) or INTWDT
X
/16, f
X
/32.
(W phase)
(W phase)
(U phase)
(U phase)
(V phase)
(V phase)
TO70
TO71
TO72
TO73
TO74
TO75
161