Renesas ZTAT H8S/2357F, Hardware Manual

Page: 391 / 1047

Rev.6.00 Oct.28.2004 page 363 of 1016
REJ09B0138-0600H
10.2.5 Timer Status Register (TSR)
Channel 0: TSR0
Channel 3: TSR3
Bit : 7 6 5 4 3 2 1 0
— — — TCFV TGFD TGFC TGFB TGFA
Initial value : 1 1 0 0 0 0 0 0
R/W : — — — R/(W) * R/(W) * R/(W) * R/(W) * R/(W) *
Note:
*
Can only be written with 0 for flag clearing.
Channel 1: TSR1
Channel 2: TSR2
Channel 4: TSR4
Channel 5: TSR5
Bit : 7 6 5 4 3 2 1 0
TCFD — TCFU TCFV — — TGFB TGFA
Initial value : 1 1 0 0 0 0 0 0
R/W : R — R/(W) * R/(W) * — — R/(W) * R/(W) *
Note:
*
Can only be written with 0 for flag clearing.
The TSR registers are 8-bit registers that indicate the status of each channel. The TPU has six TSR registers, one for each
channel. The TSR registers are initialized to H'C0 by a reset, and in hardware standby mode.
Bit 7—Count Direction Flag (TCFD): Status flag that shows the direction in which TCNT counts in channels 1, 2, 4,
and 5.
In channels 0 and 3, bit 7 is reserved. It is always read as 1 and cannot be modified.
Bit 7
TCFD
Description
0 TCNT counts down
1 TCNT counts up (Initial value)
Bit 6—Reserved: This bit cannot be modified and is always read as 1.
Bit 5—Underflow Flag (TCFU): Status flag that indicates that TCNT underflow has occurred when channels 1, 2, 4, and
5 are set to phase counting mode.
In channels 0 and 3, bit 5 is reserved. It is always read as 0 and cannot be modified.
Bit 5
TCFU
Description
0 [Clearing condition] (Initial value)
When 0 is written to TCFU after reading TCFU = 1
1 [Setting condition]
When the TCNT value underflows (changes from H'0000 to H'FFFF)