tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 192

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

14. 8-bit Timer Counter (TC0)
RA002
14.4.2 8-bit event counter mode
14.4.2.1 Setting
14.4.2.2 Operation
14.4.2.3 Double buffer
pin. The operation of TC00 is described below, and the same applies to the operation of TC01.
In the 8-bit event counter mode, the up counter counts up at the falling edge of the input to the TC00 or TC01
to "0" and T00MOD<EIN0> to "1". Set the count value to be used for the match detection as an 8-bit
value at the timer register T00REG.
becomes invalid. Be sure to complete the required mode settings before starting the timer.
TC00 pin. When a match between the up-counter value and the T00REG set value is detected, an INTT00
interrupt request is generated and the up counter is cleared to "0x00". After being cleared, the up counter
restarts counting. Setting T001CR<T00RUN> to "0" during the timer operation makes the up counter stop
counting and be cleared to "0x00".
[Hz] (in SLOW1/2 or SLEEP1 mode), and a pulse width of two machine cycles or more is required at
both the "H" and "L" levels.
(Example)
TC00 is put into the 8-bit event counter mode by setting T00MOD<TCM0> to "00", T001CR<TCAS>
Set T00MOD<DBE0> to "1" to use the double buffer.
Setting T001CR<T00RUN> to "1" starts the operation. After the timer is started, writing to T00MOD
Setting T001CR<T00RUN> to "1" allows the 8-bit up counter to increment at the falling edge of the
The maximum frequency to be supplied is fcgck/2
Refer to "14.4.1.3 Double buffer".
Operate TC00 in the 8-bit event counter mode and generate an interrupt each time 16 falling edges are detected at the
TC00 pin.
LD
DI
SET
EI
LD
LD
SET
(POFFCR0),0x10
(EIRH).4
(T00MOD),0xC4
(T00REG),0x10
(T001CR).0
Page 178
; Sets TC001EN to "1"
; Sets the interrupt master enable flag to "disable"
; Sets the INTTC00 interrupt enable register to "1"
; Sets the interrupt master enable flag to "enable"
; Selects to the 8-bit event counter mode
; Sets the timer register
; Starts TC00
2
[Hz] (in NORMAL1/2 or IDLE1/2 mode) or fs/24
TMP89FM42