mc68hc05bs8 Freescale Semiconductor, Inc, mc68hc05bs8 Datasheet - Page 60

• Manufacturer Part Number: mc68hc05bs8
• Description: Mc68hc05 Family Of Low-cost Single-chip Microcontrollers.
• Manufacturer: Freescale Semiconductor, Inc

7
When used for raster position control, the RCLK is a clock signal which is in synchronized and with
a frequency of multiples to the horizontal sync signal. The counter reset signal to PB7 pin is the
horizontal fly back signal. Both of these signals will normally come from an OSD circuit.
7.2.1
RSP - Raster Polarity
RSPW6:0 - RSPWM Data
These 7 bits contain the pulse width modulator data for the RSPWM. The RSPWM output remains
low after the counter reset, and turns high when the counter value matches this value.
CRE - Clear Reset Enable
7-4
1 (set)
0 (clear) –
1 (set)
0 (clear) –
RSPWMR
GPWMR
Raster Positioning Pulse Width Modulator Register
(RSPWM)
–
–
RSA output is zero. RSPWM waveform is output on RSB.
RSB output is zero. RSPWM waveform is output on RSA.
PB7 pin configured as reset input to the RSPWM. The DDR for PB7
should also be “0”.
PB7 pin normal I/O operation.
Address bit 7
Address bit 7
$0011
$0010
PULSE WIDTH MODULATION
ODE
RSP RSPW6 RSPW5 RSPW4 RSPW3 RSPW2 RSPW1 RSPW0 0000 0000
bit 6
bit 6
CRE
GPW5 GPW4 GPW3 GPW2 GPW1 GPW0 0000 0000
bit 5
bit 5
bit 4
bit 4
bit 3
bit 3
bit 2
bit 2
bit 1
bit 1
MC68HC05BS8
bit 0
bit 0
on reset
on reset
State
State
TPG