UPD78F9221CS-CAC-A Renesas Electronics America, UPD78F9221CS-CAC-A Datasheet - Page 127
UPD78F9221CS-CAC-A
Manufacturer Part Number
UPD78F9221CS-CAC-A
Description
MCU 8BIT 2KB FLASH 20PIN
Manufacturer
Renesas Electronics America
Series
78K0S/Kx1+r
Datasheet
1.UPD78F9221MC-5A4-A.pdf
(418 pages)
Specifications of UPD78F9221CS-CAC-A
Core Processor
78K0S
Core Size
8-Bit
Speed
10MHz
Connectivity
LIN, UART/USART
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
15
Program Memory Size
2KB (2K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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(17) Changing compare register during timer operation
<1> With the 16-bit timer capture/compare register 0n0 (CR0n0) used as a compare register, when changing
<2> If CR010 is changed during timer counting without performing processing <1> above, the value in
CR0n0 around the timing of a match between 16-bit timer counter 00 (TM00) and 16-bit timer
capture/compare register 0n0 (CR0n0) during timer counting, the change timing may conflict with the
timing of the match, so the operation is not guaranteed in such cases. To change CR0n0 during timer
counting, INTTM000 interrupt servicing performs the following operation.
<Changing cycle (CR000)>
1. Disable the timer output inversion operation at the match between TM00 and CR000 (TOC001 = 0).
2. Disable the INTTM000 interrupt (TMMK000 = 1).
3. Rewrite CR000.
4. Wait for 1 cycle of the TM00 count clock.
5. Enable the timer output inversion operation at the match between TM00 and CR000 (TOC001 = 1).
6. Clear the interrupt request flag of INTTM000 (TMIF000 = 0).
7. Enable the INTTM000 interrupt (TMMK000 = 0).
<Changing duty (CR010)>
1. Disable the timer output inversion operation at the match between TM00 and CR010 (TOC004 = 0).
2. Disable the INTTM000 interrupt (TMMK000 = 1).
3. Rewrite CR010.
4. Wait for 1 cycle of the TM00 count clock.
5. Enable the timer output inversion operation at the match between TM00 and CR010 (TOC004 = 1).
6. Clear the interrupt request flag of INTTM000 (TMIF000 = 0).
7. Enable the INTTM000 interrupt (TMMK000 = 0).
While interrupts and timer output inversion are disabled (1 to 4 above), timer counting is continued. If
the value to be set in CR0n0 is small, the value of TM00 may exceed CR0n0. Therefore, set the value,
considering the time lapse of the timer clock and CPU clock after an INTTM000 interrupt has been
generated.
Remark n = 0, 1
CR010 may be rewritten twice or more, causing an inversion of the output level of the TO00 pin at each
rewrite.
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
User’s Manual U16898EJ6V0UD
125
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