Rev. 2.0, 11/00, page 749 of 1037
28.13.5
Register Descriptions
(1) CTL Control Register (CTCR)
0
0
1
0
R
2
0
W
3
0
4
1
W
5
1
6
0
7
W
W
W
FSLB
W
FSLC
0
W
NT/PL
FSLA
CCS
LCTL
UNCTL
SLWM
Bit :
Initial value :
R/W :
The CTL control register (CTCR) controls PB-CTL rewrite and sets the slow mode. When a
CTL pulse cannot be detected with the input amplifier gain set at the CTL gain control register
(CTLGR) in the PB-CTL circuit, bit 1 (UNCTL) of CTCR is set to 1. It is automatically cleared
to 0 when a CTL pulse is detected.
CTCR is an 8-bit readable/writable register. However, bit 1 is read-only, and the rest is write-
only.
CTCR is initialized to H'30 by a reset, and in standby and module stop mode.
Bit 7: NTSC/PAL Selection Bit (NT/PL)
Selects the period of the rewrite circuit.
Bit 7
NT/PL
Description
0
NTSC mode (frame rate: 30 Hz)
(Initial value)
1
PAL mode (frame rate: 25 Hz)
Bits 6 to 4: Frequency Selection Bits (FSLA, FSLB, FSLC)
These bits select the operating frequency of the CTL rewrite circuit. They should be set
according to fosc.
Bit 6
Bit 5
Bit 4
FSLC
FSLB
FSLA
Description
0
Reserved (do not set)
0
1
Reserved (do not set)
0
fosc = 8 MHz
0
1
1
fosc = 10 MHz
(Initial value)
1
*
*
Reserved (do not set)
Note:
*
Don't care.
Summary of Contents for Hitachi H8S/2191
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