UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 86

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

86
(1) 16-bit timer counter 00 (TM00)
(2) 16-bit timer capture/compare register 000 (CR000)
TM00 is a 16-bit read-only register that counts count pulses.
The counter is incremented in synchronization with the rising edge of the count clock. If the count value is read
during operation, input of the count clock is temporarily stopped, and the count value at that point is read.
The count value is reset to 0000H in the following cases.
<1> A reset signal is generated.
<2> If TMC003 and TMC002 are cleared
<3> If the valid edge of TI000 is input in the clear & start mode entered by inputting the valid edge of TI000
<4> If TM00 and CR000 match in the clear & start mode entered on a match between TM00 and CR000
<5> If OSPT00 is set to 1 in the one-shot pulse output mode
Cautions 1. Even if TM00 is read, the value is not captured by CR010.
CR000 is a 16-bit register which has the functions of both a capture register and a compare register. Whether
it is used as a capture register or as a compare register is set by bit 0 (CRC000) of capture/compare control
register 00 (CRC00).
CR000 is set by 16-bit memory manipulation instruction.
A reset signal generation clears CR000 to 0000H.
• When CR000 is used as a compare register
• When CR000 is used as a capture register
The value set in CR000 is constantly compared with the 16-bit timer/counter 00 (TM00) count value, and an
interrupt request (INTTM000) is generated if they match. It can also be used as the register that holds the
interval time then TM00 is set to interval timer operation.
It is possible to select the valid edge of the TI000 pin or the TI010 pin as the capture trigger. Setting of the
TI000 or TI010 valid edge is performed by means of prescaler mode register 00 (PRM00) (refer to Table 6-
2).
Address: FF12H, FF13H
Symbol
Address: FF14H, FF15H
Symbol
CR000
TM00
2. When TM00 is read, count misses do not occur, since the input of the count clock is
Figure 6-3. Format of 16-bit Timer Capture/Compare Register 000 (CR000)
temporarily stopped and then resumed after the read.
7
7
6
6
Figure 6-2. Format of 16-bit Timer Counter 00 (TM00)
5
5
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
After reset: 0000H
After reset: 0000H
FF13H
4
FF15H
4
3
3
User’s Manual U16898EJ5V0UD
2
2
1
1
R/W
R
0
0
7
7
6
6
5
5
4
4
FF12H
FF14H
3
3
2
2
1
1
0
0