SH7055S Datasheet, PDF (267/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Timer Control Registers 1A, 1B, 2A, 2B (TCR1A, TCR1B, TCR2A, TCR2B)
TCR1A, TCR2A
Bit:
7
—
Initial value:
0
R/W: R
6
5
4
3
2
1
0
—
CKEGA1 CKEGA0 CKSELA3 CKSELA2 CKSELA1 CKSELA0
0
0
0
0
0
0
0
R
R/W
R/W
R/W
R/W
R/W
R/W
TCR1B, TCR2B
Bit:
7
—
Initial value:
0
R/W: R
6
5
4
3
2
1
0
—
CKEGB1 CKEGB0 CKSELB3 CKSELB2 CKSELB1 CKSELB0
0
0
0
0
0
0
0
R
R/W
R/W
R/W
R/W
R/W
R/W
• Bits 7 and 6—Reserved: These bits always read 0. The write value should always be 0.
• Bits 5 and 4—Clock Edge 1 and 0 (CKEGx1, CKEGx0): These bits select the count edge(s)
for external clock TCLKA and TCLKB input.
Bit 5: CKEGx1
0
1
x = A or B
Bit 4: CKEGx0
0
1
0
1
Description
Rising edges counted
Falling edges counted
Both rising and falling edges counted
Count disabled
(Initial value)
• Bits 3 to 0—Clock Select A3 to A0, B3 to B0 (CKSELA3 to CKSELA0, CKSELB3 to
CKSELB0): These bits select whether an internal clock or external clock is used.
When an internal clock is selected, scaled clock φ" is selected from φ', φ'/2, φ'/4, φ'/8, φ'/16,
and φ'/32.
When an external clock is selected, TCLKA, TCLKB, TI10 pin input, or a TI10 pin input
multiplied clock is selected.
When TI10 pin input and TI10 pin input clock multiplication are selected, set CKEG1 and
CKEG0 in TCR10 so that TI10 input is possible.
Rev.2.0, 07/03, page 229 of 960