gc80c510 CORERIVER Semiconductor, gc80c510 Datasheet - Page 58

• Manufacturer Part Number: gc80c510
• Description: Eprom/rom 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

6.2.4.2 Timer/Counter 1
6.2.4.2.1 Time-base
6.2.4.2.2 Mode2
registers, TH1 and TL1. They can be configured to operate only as timers counting machine cycles and
configured only as a “Timer”, the timer counts clock cycles. The timer clock can be programmed to be
thought of as 1/12 of the system clock.
operate like the standard 80C52 family, counting at the rate of 1/12 of the clock speed. This will ensure
that timing loops on the MiDAS1.1 family and the standard 80C52 family can be matched. This is the
default mode of operation of the MiDAS1.1 timers. The Timer/Counter 1 is supported with only Mode 2.
counter, while TH1 holds the reload value. When the TL1 register overflows from FFH to 00H, the TF1
bit in TCON is set and TL1 is reloaded with the contents of TH1, and the counting process continues
from reloaded value. The reload operation leaves the contents of the TH1 register unchanged.
The Timer/Counter 1 has two 8-bit registers, TH1 and TL1. (Similarly Timer/Counter 1 has two 8-bit
The MiDAS1.1 family gives the user one time base for the timer. The timers can be programmed to
In Mode 2, the Timer/Counter 1 is in the auto reload mode. In this mode, TL1 operates as an 8-bit
Time[sec]
=
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⎛
⎜
⎝
F
12
OSC
⎞
⎟
⎠
−
1
×
(
2
8
−
TH1
)
Functional Description