em78p257 ELAN Microelectronics Corp, em78p257 Datasheet - Page 16

• Manufacturer Part Number: em78p257
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

This specification is subject to change without prior notice.
11. RC (TCC Prescaler Counter)
12. RD (IR Control Register)
TCC prescaler counter can be read and written.
*V: valid value
• Bit 7: Bit 6 (DP1:DP0) : Ratios of duty and period of modulated frequency
• Bit 5: Bit 4 ( MF1:MF0 ) : Modulated frequency
• Bit 3(IRE)
• Bit 2(HF) High Frequency. When HF = 1; the Low-time part of the generated pulse is modulated with
• Bit 1(LGP) Long Pulse. When LGP = 1, the contents of the High-time register are ignored. A single
a frequency Fosco.
pulse is generated; its pulse is high.
PSR2 PSR1 PSR0
0: Disable IRE. Disable H/W Modulator Function.
1: Enable IRE. Disable RB (Bit4(TCCBTE) and Bit5(TCCBTS)), and TCCBX acts as a down counter.
Enable H/W Modulator Function. Pin 67 defined as IR OUT.
Pulse width = (Contents of Low-time register) x (number of pulse) x (1/Fosc)
If HF = 1, this pulse is modulated with a frequency Fosco (selected by MF1,MF0).
0
0
0
0
1
1
1
1
DP1
DP1
7
MF1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Infrared Remote Enable bit
DP0
6
0
1
0
1
0
1
0
1
DP0
MF0
0
1
0
1
0
1
0
1
Bit7
V
-
-
-
-
-
-
-
MF1
5
Bit6
1:2(default)
V
V
-
-
-
-
-
-
Fosc/1
Fosc/4
Fosc/8
Fosco
Ratio
1:3
1:4
-
-
Bit5
V
V
V
-
-
-
-
-
MF0
4
16
Bit4
V
V
V
V
-
-
-
-
Bit3
IRE
1
V
V
V
V
V
3
-
-
-
2
Bit2
V
V
V
V
V
V
-
-
1 : 2
HF
2
Bit1
V
V
V
V
V
V
V
-
Bit0
V
V
V
V
V
V
V
V
LGP
1
EM78P257
1
3
07.27.2004 (V1.4)
OTP ROM
TCC Rate
1:128
1:256
1:16
1:32
1:64
1:2
1:4
1:8
PWM
0
1 : 3