UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 97

• 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

register 000 (CR000) is changed is smaller than that of 16-bit timer counter 00 (TM00), TM00 continues counting,
overflows and then restarts counting from 0. Thus, if the value (M) after the CR000 change is smaller than that (N)
before the change, it is necessary to restart the timer after changing CR000.
6.4.2
Remark Interval time = (N + 1) × t
When the compare register is changed during timer count operation, if the value after 16-bit timer capture/compare
Remark N > X > M
The basic operation setting procedure is as follows.
<1> Set the CRC00 register (see Figure 6-14 for the set value).
<2> Set the count clock by using the PRM00 register.
<3> Set any value to the CR000 register (0000H cannot be set).
<4> Set the TMC00 register to start the operation (see Figure 6-14 for the set value).
Remarks 1. For the setting of the TI000 pin, see 6.3 (5) Port mode register 3 (PM3).
Setting
TM00 count value
Figure 6-13. Timing After Change of Compare Register During Timer Count Operation (N → M: N > M)
TM00 count value
External event counter operation
Count clock
INTTM000
Count clock
2. For how to enable the INTTM000 interrupt, see CHAPTER 12 INTERRUPT FUNCTIONS.
N = 0001H to FFFFH (settable range)
CR000
CR000
Timer operation enabled
0000H
X – 1
N
0001H
t
N
Figure 6-12. Timing of Interval Timer Operation
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
X
User’s Manual U16898EJ5V0UD
N
Clear
Interrupt request generated
0000H 0001H
N
FFFFH
M
N
0000H
Clear
Interrupt request generated
N
0000H 0001H
0001H
0002H
N
N
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