HCS08 datasheet(146/198 Pages) NXP

146 / 198 page

Timer/Pulse-Width Modulator (S08TPMV2)

MC9S08QD4 Series MCU Data Sheet, Rev. 6

146

Freescale Semiconductor

Figure 11-2. TPM Block Diagram

The central component of the TPM is the 16-bit counter that can operate as a free-running counter, a

modulo counter, or an up-/down-counter when the TPM is configured for center-aligned PWM. The TPM

counter (when operating in normal up-counting mode) provides the timing reference for the input capture,

output compare, and edge-aligned PWM functions. The timer counter modulo registers,

TPMxMODH:TPMxMODL, control the modulo value of the counter. (The values 0x0000 or 0xFFFF

effectively make the counter free running.) Software can read the counter value at any time without

affecting the counting sequence. Any write to either byte of the TPMxCNT counter resets the counter

regardless of the data value written.

PRESCALE AND SELECT

16-BIT COMPARATOR

MAIN 16-BIT COUNTER

16-BIT COMPARATOR

16-BIT LATCH

PORT

16-BIT COMPARATOR

16-BIT LATCH

CHANNEL 0

CHANNEL 1

LOGIC

INTERRUPT

PORT

LOGIC

16-BIT COMPARATOR

16-BIT LATCH

CHANNEL n

PORT

LOGIC

COUNTER RESET

DIVIDE BY

CLOCK SOURCE

OFF, BUS, XCLK, EXT

BUSCLK

XCLK

SELECT

SYNC

INTERRUPT

1, 2, 4, 8, 16, 32, 64, or 128

LOGIC

CLKSA

CLKSB

PS2

PS1

PS0

CPWMS

TOIE

TOF

ELS0A

CH0F

ELS0B

ELS1B

ELS1A

ELSnB

ELSnA

CH1F

CHnF

CH0IE

CH1IE

CHnIE

MS1B

MS0B

MSnB

MS0A

MS1A

MSnA

TPMxMODH:TPMxMO

TPMxC0VH:TPMxC0VL

TPMxC1VH:TPMxC1VL

TPMxCnVH:TPMxCnVL

TPMxCHn

TPMxCH1

TPMxCH0

TPMxCLK

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