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Rev. 1.0, 07/01, page 153 of 372
Internal clock:
External clock: FTCI
FTIOA
FTIOB
FTIOC
FTIOD
IRRTW
Control logic
Clock
selector
Comparator
TCNT
Internal
data bus
Bus interface
Legend:
TMRW: Timer mode register W (8 bits)
TCRW: Timer control register W (8 bits)
TIERW: Timer interrupt enable register W (8 bits)
TSRW: Timer status register W (8 bits)
TIOR: Timer I/O control register (8 bits)
TCNT: Timer counter (16 bits)
GRA: General register A (input capture/output compare register: 16 bits)
GRB: General register B (input capture/output compare register: 16 bits)
GRC: General register C (input capture/output compare register: 16 bits)
GRD: General register D (input capture/output compare register: 16 bits)
GRA
GRB
GRC
GRD
TMRW
TCRW
TIERW
TSRW
TIOR
ø
ø/2
ø/4
ø/8
Figure 12-1 Timer W Block Diagram
12.2 Input/Output Pins
Table 12-2 summarizes the timer W pins.
Table 12-2 Timer W Pins
Name Abbreviation Input/Output Function
External clock input FTCI Input External clock input pin
Input capture/output
compare A
FTIOA Input/output Output pin for GRA output compare or
input pin for GRA input capture
Input capture/output
compare B
FTIOB Input/output Output pin for GRB output compare,
input pin for GRB input capture, or
PWM output pin in PWM mode
Input capture/output
compare C
FTIOC Input/output Output pin for GRC output compare,
input pin for GRC input capture, or
PWM output pin in PWM mode
Input capture/output
compare D
FTIOD Input/output Output pin for GRD output compare,
input pin for GRD input capture, or
PWM output pin in PWM mode